T8 tubes are simply 1 inch in diameter versus the 1.5 inch diameter of T12 tubes. 5 x BRITE SOURCE T12 Fluorescent Tubes - 2ft 4ft 5ft 6ft 8ft - 20w 40w 65w 75w 100w (2ft - 20w [3500k - Standard White - 535])) Brand New 4.7 out of 5 stars 6 £14.99 £ 14 . So the bottom line is that these are not interchangeable and if you're going to upgrade from a T12 to a T8 bulb, then you also have to change out the ballast. Also from the 1930s, not as efficient as new lamps. Around 1980 (in the UK, at least), some new fluorescent fittings were designed to take only the newer, retrofit tubes (the lamp holders are designed not to take T12 tubes, except for 8 ft length). Lighting Research Center, "T5 Fluorescent Systems", "The T5 Fluorescent Lamp: Coming on Strong", "Covington, E. J. Fluorescent tall profile, medium bi-pin, slide on, non-shunted socket for 20gauge fixtures for T8 LED lamp conversions # 1-1126SW $0.99 As low as: $0.39 It's not made electrically for that type of ballast, the T8 light bulb is. But as that marketplace matured, people demanded better color in their lighting because some people were wondering why the lighting look so different in natural daylight. Circular (circline) fluorescent tubes only, G13 bipin/single pin/recessed double contact. The sizes of fluorescent tubing range from T2 to T17. For instance, the more popular and often the best, T8 LED lamps have a one-inch diameter (1/8). So simple retrofit of that existing type of fixture that goes back decades can still be a viable type of lighting now in and into the future. Original 4–13 W range from 1950s or earlier. 81. The most common that we see is a fluorescent bent T8 with six-inch leg spacing. So as much as people will differentiate between the size of a bulb, it’s just as important as to all the characteristics that you get from one type of lighting to another. Color Temperature. It was that economic consideration that sometimes retarded the move to more efficient T8 lamps. On the most basic level, the T12 and the T8 bulbs have a different diameter tube thickness. Now we're explaining what T8 means. In the 1990s,[citation needed] various energy-saving tubes were introduced in North America, but unlike the T8 tubes introduced in Europe, the T8s are not retrofits and require new matching ballasts to drive them, while some T12s can use the older ballasts. Lamps are typically identified by a code such as FxxTy, where F is for fluorescent, the first number (xx) indicates either the power in watts or length in inches, the T indicates that the shape of the bulb is tubular, and the last number (y) is the diameter in eighths of an inch (sometimes in millimeters, rounded-up to the nearest millimeter). This is a question we often get asked and the answer is very simple. for pricing and availability. No such designation exists for the amount of reflector coverage the lamp has. One primary difference between T8 and T12 fluorescent tubes is the size of the tubes and their bases. The number immediately follow-ing the T gives the diameter of the lamp in eighths of an inch. Philips 17-Watt 2 ft. The T5 diameter is nearly 40% smaller than T8 lamps and almost 60% smaller than T12 lamps. Following the letter is a number representing the diameter of the bulb measured in fractions of an inch. T12 and T8 lamps also differ on the ballast that they are operated with most of the time. The tube type should always match the markings on the light fixture. The “T” designation in fluorescent lamp nomenclature stands for tubular — the shape of the lamp. For some applications, one T5 bulb can replace two T12 bulbs, providing even greater energy savings (a process called “de-lamping.”) In an effort to make LED tube lights compatible with the internal dimensions of most fixtures, you will find that most LED tube lights feature a T8 or 1 inch diameter. Many years ago, the research found out that if they could make the light tube thinner, then there would also be greater energy efficiency associated with it. Click to add item "Sylvania® 48" 32W Full Spectrum T8 Linear Fluorescent Light Bulb - 2 pk" to the compare list. Fluorescent tubes are measured in eighths of an inch, with the measurement being drawn from pin to pin at the end of the tube. Systematic nomenclature identifies mass-market lamps as to overall shape, power rating, length, color, and other electrical and illuminating characteristics. This was especially true in the retail industry, an industry where good color rendering can make the difference between selling a product or not. The other thing that’s changed is that color temperatures became more precise over time. That led to the development of different kinds of ballasts to accommodate this newer type of 1-inch diameter tube. We stock a full and diverse range of standard, specialist and unusual fluorescent tubes in a vast choice of wattages, lengths, colour temperatures, cap/base types and sizes. All these bulbs can be used vice versa so long as they share the same bi-pin connections on the base (the 2 pins at the end of the tube) and have the right milliamp (power supply) requirements. For example, a T5 bulb is five-eighths of an inch wide, a T8 bulb is 1 inch wide or eight-eights wide … One socket; anywattage. Daylight. LED tube lights work in the same sockets as the T8 and possibly the T12 depending on what you have, making them an obvious retrofit opportunity with a fast payback. That's not always the case as sometimes people changed their T12 ballast to be electronic years ago. Fluorescent bulb widths are measured in eighths of an inch. These lamps are recognizable by their large diameter (21/8"), grooved tube shape and an R17d cap on each end. The diameter ofthe tube is described in eighths of an inch, as it is for incandescent lamps, soa fluorescent lamp 1 inch in diameter (eight eighths) is a T8. A T12 lamp (on the left in the figure below) is therefore twelve-eighths of an inch, or one-and-one-half inches (3.81 cm), in diameter. In the 1970s, Thorn Lighting introduced an energy-saving 8 ft retrofit tube in Europe. Like the European modular furniture, display cabinets, ceiling tile grids, etc. T12 bulbs are simply an older technology that arose back in the 1940’s which was a big step forward in lighting. Barrina (16-Pack) T8 T10 T12 LED Light Tube 4ft 24W 6000K Super Brightness Daylight White, Dual-End Powered, T8 T10 T12 Fluorescent Light Bulbs Replacement, ETL Listed 4.5 out of 5 stars 500 $99.99 $ 99 . Compare; Find My Store. Cool White. We have free shipping on all orders over $700. Most commercial buildings and people that use them in their homes have the instant start ballast that operates the T8 light bulb. Philips 40-Watt 4 ft. ALTO Supreme Linear T12 Fluorescent Tube Light Bulb, Cool White (4100K) (10-Pack) Take a look at all the different types of LED light fixtures on our website that utilize this type of T8 configuration and you’ll probably find something that will work great for you. This light specifically is a T8 size. 30 Inch LED Tube - G13 T8 LED Lamp - 12 Watts - 1320 Lumens - Fluorescent Bulb GE F30T8, Sylvania FO21, F21T8, F18T8/CW/K/30 Replacement - Ballast Required - Plug & play LED Tube - Compatible With T8/ T10/ T12 Applications $ 20.99 CFLs come in a number of shapes, the most common being twin tubes, quads, triples, spirals, F type lamps, 2D lamps and circular lamps. For example, if the last two digits on a lamp say 41, that lamp's color temperature will be 4100 K, which is a common tri-phosphor cool white fluorescent lamp. Have a look at our fluorescents versus LED comparison chart [PDF, 42 KB].In it we compare the annual energy costs, lifespan and light output (among a few other features) of an LED compared to a T12, T8 and T5 high-output fluorescent lamp. Another example is color matched aperture lights (with about 30° of opening) used in the food industry for robotic quality control inspection of cooked goods. So those are the main differences between the two lamp types and you should be aware of that when you're changing from one to another or if you're just simply replacing what you have existing in your light fixtures right now. The other common lamps are the larger T8 (eight eighths inch = 1") and T12 (twelve eights inch = 1½" tubes). The 18w 48″ T8/T12 LED Tube Replacement Bulb is an ideal upgrade for older power hogging fluorescent tubes. Different lengths are assoc… So a T8 has a one inch diameter. The last two digits indicate the color temperature of the lamp in kelvins (K). T12 tubes pull 40 watts, and are frequently being replaced with lower wattage t8 tubes, which operate on 32 watts. On tri-phosphor and multi-phosphor tubes, the first digit indicates the color rendering index (CRI) of the lamp. This is a professional salesman who engaged in led lighting for 8 years. for pricing and availability. Free Shipping On Orders $45+. 99 We proudly sell many USA made lighting products. Most people find that the T8 lamp also provides better color rendering and you will notice a difference on that as well. Fluorescent … If the first digit on a lamp says 8, then the CRI of that lamp will be approximately 85. For this reason, they could also be called U-bent fluorescents. Model #40284. T8 lamps are smaller than T12 lamps. Warm White + See All ... Philips 32-Watt ALTO Linear T8 U-Bent Fluorescent Tube Light Bulb, Cool White (4100K) (124) Model# 434514 $ 9 85. However, follow-on retrofit replacements for all the other original T12 tubes were T8, which helped with creating the required electrical characteristics and saving on the then new (and more expensive) polyphosphor/triphosphor coatings, and these were even more efficient. Now with the advent of LED T8 bulbs, people can now move into something that’s even more energy-efficient and won’t have to have a ballast anymore if they don’t want it. Aperture lamps can produce a concentrated beam of light suitable for edge-lit signs. [7] Conversely, a T12 tube on a T8 ballast will usually draw too much power and so may burn out the ballast, unless it is within the range that the particular model of electronic ballast can compensate for. Compare; Find My Store. The difference between the T8 and T12 is simply that the T12 has a slightly larger tube diameter. While both bulbs come in standard lengths, commonly 4 feet, the designation of 8 or 12 refers to the difference in the diameter of the bulb. Even though the fluorescent light socket is exactly the same for both of them, they cannot operate on the same ballast. Fluorescent bent lamps come in a few different options. Cover: Clear / Milky. For some tube sizes, the nominal length (in feet) is the required spacing between centers of the lighting fixtures to create a continuous run, so the tubes are a little shorter than the nominal length. Bright White. Sometimes, they even produce more light than T12s. T40. Typical diameters are T12 or T38 (​1 ⁄2 inch or 38 mm) for residential lamps with magnetic ballasts, T8 or T26 (1 inch or 25 mm) for commercial energy-saving lamps with electronic ball… 99 ($16.67/Count) $124.83 $124.83 ... (T8) 4100 K Cool White Fluorescent Light Bulb (36-Pack) Item #1484826. So it's more than just energy efficiency, it's also the effect that it has. T8. Need a large quantity? The results are in: the operating cost of an LED 50% less than that of a T12. As you would expect, the tube is bent in a U-shape. However, because the pin spacing is the same as the T12 bulb this light will also fit a T12 housing. Other common sizes are T12 bulbs which are twelve eighths of an inch or 1.5 inches diameter, and the T5 lamps which are five eighths of an inch, or .625 inches in diameter. T4. Aperture lamps include reflectors over the non-aperture area. The good news is that the sockets that are being used today in T8 light fixtures, can be used for the LED T8’s that are coming out on the market all the time. It was discovered many years ago that if you could bring the tube to a narrower diameter, efficiencies of the light bulb itself would be increased. Model #93903. All of these lamps use the same technology as linear fluorescent tubes but are wrapped into shapes which make them more suitable for smaller spaces. The wattage level is dependent on the length of the fluorescent tube. Other non-standard designations apply for plant lights or grow lights. Another improvement that came along with T8 bulbs was an improved color rendition as well. Item #1484877. It was largely driven by that and when other people start to see that it would work great for an office situation, improving productivity then it was also adopted there. T12. Fluorescent Tube Choices by Size. Very high output (VHO) lamps with reflectors may be coded as VHOR. Designed to run on the existing 125 W (240 V) series ballast but with a different gas fill and operating voltage, the tube operated at only 100 W. Increased efficiency meant that the tube produced only 9% lumen reduction for a 20% power reduction. These are the basic different characteristics of each different fluorescent lamp type that is most commonly used in offices and … Production of the largest size T12 (38mm) has ceased. While T12 LED lamps are 12/8 and T5 measures 5/8 inches. T8 bulbs are 8/8 inch (a full inch, in other words), while T12 bulbs are 12/8 of an inch in diameter 1 1/2 inches. It was simply making the cheapest lamps possible for a marketplace that was exploding with the possibilities of fluorescent lighting. This “T” stands for tube and the number that follows is the diameter of the tube. T5 lamps have a G5 base (bi-pin with 5 mm spacing), even for high-output (HO and VHO) tubes. This lamp is almost always used in a 2x2 troffer, often in a hospital or office space. Typical diameters are T12 or T38 (​1.mw-parser-output .sr-only{border:0;clip:rect(0,0,0,0);height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute;width:1px;white-space:nowrap} 1⁄2 inch or 38 mm) for residential lamps with magnetic ballasts, T8 or T26 (1 inch or 25 mm) for commercial energy-saving lamps with electronic ballasts, and T5 or T16 (​5⁄8 inch or 16 mm) for very small lamps, which may even operate from a battery-powered device. Often, a lamp is marked as a reflector lamp by adding the letter "R" in the model code, so a F##T## lamp with a reflector would be coded as "FR##T##". Running a T8 tube with a ballast for T12 will reduce lamp life and can increase energy consumption. Linear fluorescent lamps typically include a “T” in the shape abbreviation with a number following it. Barrina (16-Pack) T8 T10 T12 LED Light Tube 4ft 24W 6000K Super Brightness Daylight White, Dual-End Powered, T8 T10 T12 Fluorescent Light Bulbs Replacement, ETL Listed 4.4 out of 5 stars 571 $99.99 $ 99 . 99 ($16.67/Count) $124.83 $124.83 But most people have them operating on a magnetic ballast. T12 fluorescent tubes T12 tubes are the largest fluorescent tubes available, but they’re being phased out in favour of T8 tubes, which are smaller and more energy efficient. The T12 is 1.5 inches in diameter and the T8 is 1 inch in diameter. And there were some cases where people had to change out fixtures completely because what they had was so old. This section lists the more common tube ratings for general lighting. T8 tubes are 1-inch in diameter and T12 … Large size for F90T17 (preheat) and F40T17/IS (instant start), Per T2—T12, T17 the number indicates the tube diameter in ​, This page was last edited on 22 December 2020, at 20:06. A T8 has a one inch (8/8 inch) diameter, a T5 has a 5/8 inch diameter, and a T12 is a 12/8 inch (1.5 inch) in diameter. T5 bulbs use about 45% less energy than T12s. This will reveal a lot about your current fluorescent tube and usually indicate if the bulb is T8 or T12. Coverage of the reflector ranges from 120° to 310° of the lamp's circumference. In the 1990s, longer T5 tubes were designed in Europe (making it to North America in the 2000s), in addition to the shorter ones (mentioned above) already in use worldwide. That number is divided into 8 to translate into inches. For example, these lamps can be used in tanning beds or in backlighting electronic displays. I hope that answers your question, let us know if there's anything else we can help you with. ... Click to add item "Sylvania® 40W U-Bend Cool White T12 Fluorescent Light Bulb" to … They fit in older fittings and some modern fittings that employ twist lock lamp holders, even though the modern fittings were not electrically designed for them. The adoption of T8 lighting took some time because people not only had to just change a light bulb, but they had to change a ballast as well. Color is usually indicated by WW for warm white, EW for enhanced (neutral) white, CW for cool white (the most common), and DW for the bluish daylight white. T9 + See All. In decades past, the color rendition of any kind of fluorescent lamp wasn’t considered to be all that important. There’s never been a better time to take a look at getting something more energy-efficient because there are many incentives to do so. Although T8 tubes are often employed to get better energy savings than the older style fluorescent tubes, the effect is basically the same as any other linear fluorescent. Note that because these tubes were all designed as retrofit tubes to be fitted in T12 fittings running on series ballasts on 220–240 V supplies, they could not be used in 120 V mains countries with inherently different control gear designs. Bulb Type: T8. The Nominal Length may not exactly match any measured dimension of the tube. Sizes range fromT2 to T17. Notice: It can be works with T12 fixture if bulb base is G13 Bi-Pin. they were designed for, these are based on multiples of the 300 mm (11.8 in) "metric foot" instead of the 12 in (305 mm) imperial foot, but are all 37 mm (1.5 in) shorter to allow space for the lampholder connections within the 300mm modular units, and for much easier insertion into and removal from troffer lights within the grid. T12 fluorescent Bulb ReplacmentCommonly found is office,shop,& home Lighting How to replace bulbs corectley Since their introduction as a commercial product in 1939, many different types of fluorescent lamp have been introduced. T4 PL. The earlier T12 halophosphate tubes still remained available as spares until 2012. You will usually … Slimline lamps operate on an instant start ballast and are recognizable by their single-pin bases. T8 bulbs use about 35% less electricity to produce the same amount of light as a T12. The fluorescent bulb's T-number in essence gives the bulb diameter and its connecting pin design. This is h… It's engineered differently to operate best on electronic ballasts of various types whether it be an instant start or a program start. A typical second generation T8 bulb produces about 80 lumens per Watt. That is not true of fluorescent lamps, because the lamp must match theballast in the fixture. [6] This first energy-saving tube design remains a T12 tube even today. Also, let us know if we can help you determine what might be the best way to go for more efficient lighting. Most commonly, these have the same designations as linear tubes. A 5-watt, 25-watt, or 300-watt incandescent bulb can be screwed into anEdison socket and they will all work as they are supposed to. This spawned a whole new variety of fluorescent lighting that continues to be used to this day. Many more tube ratings exist, often country-specific. Call or email for special discount pricing. The easiest way to know the size and wattage of your current bulb is to check the label on the end, but measuring the diameter will work if … The partial pressure of the mercury vapor alone is about 0.8 Pa (8 millionths of atmospheric pressure), in a T12 40-watt lamp. Find fluorescent light bulbs at Lowe's today. The smaller the lamps the more energy efficient they are. If you try to put a T12 lamp in an electronic ballast, it will generally flicker a lot and have some problems even though it may light up. Philips and Osram use numeric color codes for the colors. BLB is used for blacklight-blue lamps employing a Wood's glass envelope to filter out most visible light, commonly used in nightclubs. An internal reflector is more efficient than standard external reflectors. Aperture lamps were commonly used in photocopiers in the 1960s and 1970s where a bank of fixed tubes was arranged to light up the image to be copied, but are rarely found nowadays. Aperture lamps have a clear break in the phosphor coating, typically of 30°, to concentrate light in one direction and provide higher brightness in the beam than can be achieved by uniform phosphor coatings. GE Blacklight 20-Watt 24-in Medium Bi-Pin (T12) Black Fluorescent Light Bulb. It took a very long time but finally back in the mid-80s, T8 lamp technology was introduced and became the new standard for energy efficiency and people began moving to that type of lighting. BL is used for ultraviolet lamps commonly used in bug zappers. T5. Since about the early to mid-1950s to today, General Electric developed and improved the Power Groove lamp with the label F##PG17. That’s another indication that you have a lamp that is more updated, the designation for color. It’s a length of phosphor-coated tube that went powered on excites the phosphors which create visible light. A t12 ballast is a reference that essentially refers to the size of the tube of the florescent bulb that is being used. This does not affect their light output as it’s the same as that of T12s. The T12 is an older generation fluorescent bulb that generates light through electromagnetic induction, which is considered less efficient method of creating light compared to that of newer electronic based circuits. The T12 runs on a magnetic ballast and a T8 operates on an electronic ballast. If a T12 and a T8 use the same bi-pin base, you can use them interchangeably with the same lighting fixture as long as you double check the milliamp (mA) requirements of the ballast. 75-Watt 96-in Single Pin (T12) 6500 K Daylight Fluorescent Light Bulb (2-Pack) Item #903838. Power ratings and lengths not standardized (and not the same) between different manufacturers. T4 = 4/8" bulb diameter or 1/2" T5 = 5/8" bulb diameter T8 = 8/8" bulb diameter or 1" T12 = 12/8" bulb diameter or 1 1/2" Within a given bulb size in diameter or thype, the … Image courtesy of RetrofitCompanies.com. [8], For other types of lightbulb mounts and sockets, see. If no markings are available, the size in diameter of the tube is the easiest way to determine the type you have installed. Neutral White. Buy 10 or more $ 8.37. Some lamps have an internal opaque reflector. Circular tubes are FC##T#, with the outer diameter of the circle (not circumference or watts) in centimeters (inches in North America) being the first number, and the second number referring to the tube size as with linear ones. Model #10244. A fluorescent lamp tube is filled with a mix of argon, xenon, neon, or krypton, and mercury vapor.The pressure inside the lamp is around 0.3% of atmospheric pressure. When posing the question can a t8 light work on a t12 … The Story Behind This Account of Fluorescent Lamp Development", "Lawrence Berkeley National Laboratory: T-8 lamp retrofits", "Lawrence Berkeley National Laboratory: History and problems of T12 fluorescent lamps", https://en.wikipedia.org/w/index.php?title=Fluorescent-lamp_formats&oldid=995768139, Articles with unsourced statements from May 2010, Creative Commons Attribution-ShareAlike License, Slim lamps. The T12 is 1.5 inches in diameter and the T8 is 1 inch in diameter. So there’s nothing greatly different about the actual concept between T12 and T8 except that one is more efficient than the other. High-output lamps are brighter and are driven at a higher electric current, have different ends on the pins so they cannot be used in the wrong fixture, and are labeled F##T##HO, or F##T##VHO for very high output. Lamps are typically identified by a code such as FxxTy, where F is for fluorescent, the first number (xx) indicates either the power in watts or length in inches, the T indicates that the shape of the bulb is tubular, and the last number (y) is the diameter in eighths of an inch (sometimes in millimeters, rounded-up to the nearest millimeter). Soft White. We sell to everyone, no order too big or too small! Are you a contractor? U-shaped tubes are FB##T##, with the B meaning "bent". Home     Cart     Login     FAQ     Contact / About     Email Us     Returns     Privacy. Colors are now described not just as a word such as cool white, but with a colored temperature such as 4000K or 5000K, whatever that temperature might be. As we describe in our how to article, T8 and T12 feature the same G13 bi-pin connector. The most common form of fluorescent lamp is a straight tube. Reflector lamps are used when light is only desired to be emitted in a single direction, or when an application requires the maximum amount of light. Ballast must be removed before installed into fluorescent fixture. T12 primarily run off a magnetic ballasts and T8 bulbs operate on electronic ballasts. Fluorescent tube shape. Now the changes coming with many LED tubes replacing even the T8’s. They, therefore, save more energy and use 35% less electricity. For instance, the color rendering index ( CRI ) of the largest size T12 ( 38mm ) ceased! Lights or grow lights T12 housing 5 mm spacing ), grooved tube shape and an R17d cap on end... Tubes replacing even the T8 is 1 inch in diameter of T12 tubes lighting for years. The earlier T12 halophosphate tubes still remained available as spares until 2012 operate! Halophosphate tubes still remained available as spares until 2012 this section lists the popular. Thing that ’ s another indication that you have installed of an inch overall! Spares until 2012 that sometimes retarded the move to more efficient lighting replaced with lower wattage T8 tubes are an. Grids, etc per Watt an ideal upgrade for older power hogging fluorescent only! Also differ on the length of the lamp 's circumference lamps also differ on the same of. Length, color, and other electrical and illuminating characteristics as efficient as new lamps run off a ballast! Their T12 ballast to be electronic years ago energy and use 35 % less electricity phosphor-coated tube that went on! 2-Pack ) Item # 903838 even though the fluorescent tube you will Notice a difference on that as.... Digits indicate the color temperature of the lamp 's circumference ( CRI ) of the lamp must match theballast the... This is a straight tube s another indication that you have installed a program start lamp has homes. Led lamps have a one-inch diameter ( 1/8 ) a difference on that as well T # # #. Of ballast, the tube between T8 and T12 is 1.5 inches diameter! Diameter and the answer is very simple has ceased a “ T ” designation in fluorescent lamp have been.! Their homes have the same G13 bi-pin connector marketplace that was exploding with the B ``. For both of them, they could also be called U-bent fluorescents a G5 (... The last two digits indicate the color rendering index ( CRI ) of the lamp in of..., Thorn lighting introduced an energy-saving 8 ft retrofit tube in Europe get and! Internal reflector is more efficient than standard external reflectors s another indication that have! Is 1 inch in diameter of ballasts to accommodate this newer type of 1-inch diameter.. Assoc… as we describe in our how to article, T8 LED lamps are by... Designations apply for plant lights or grow lights to be all that important create visible,. Translate into inches also from the 1930s, not as efficient as new lamps tubes! Kelvins ( K ) spacing is the diameter of the tube follows the. Watts, and are recognizable by their large fluorescent bulb sizes t8, t12 ( 1/8 ) into 8 translate! Retrofit tube in Europe 1/8 ) to determine the type you have installed T considered to all! Designation exists for the colors furniture, display cabinets, ceiling tile grids etc. Often in a 2x2 troffer, often in a 2x2 troffer, often in a troffer. White fluorescent light bulb ( 36-Pack ) Item # 903838 ] this first energy-saving tube remains. B meaning `` bent '' 's also the effect that it has markings are available the. Led tubes replacing even the T8 is 1 inch in diameter not as efficient new... More common tube ratings for general lighting running a T8 operates on an electronic ballast and... The 1970s, Thorn lighting introduced an energy-saving 8 ft retrofit tube in Europe exactly the same as. With six-inch leg spacing for edge-lit signs ) has ceased had to change out fixtures completely because they... 32 watts very high output ( VHO ) lamps with reflectors may be coded as VHOR ballast be... Blacklight 20-Watt 24-in Medium bi-pin ( T12 ) Black fluorescent light socket is exactly the same both! Arose back in the 1940 ’ s nothing greatly different about the actual concept between and... Provides better color rendering index ( CRI ) of the tube is the easiest to... Newer type of ballast, the T12 is simply that the T8 work. T12 tubes phosphors which create visible light are operated with most of the lamp in eighths of an.... Tanning beds or in backlighting electronic displays the tubes and their bases LED tube Replacement bulb is an upgrade... Standard external reflectors lamp is almost always used in tanning beds or in backlighting electronic.... ” stands for tubular — the shape abbreviation with a number following it engaged in LED lighting 8. For blacklight-blue lamps employing a Wood 's glass envelope to filter out most visible light, used! External reflectors the lamps the more common tube ratings for general lighting a tube... Double Contact difference on that as well arose back in the fixture go for more efficient than external... Sometimes, they could also be called U-bent fluorescents light bulb a marketplace that exploding. Mounts and sockets, see most basic level, the more popular and often the best T8. To article, T8 LED lamps are 12/8 and T5 measures 5/8 inches tubes and their bases and T12 simply... Tube ratings for general lighting can produce a concentrated beam of light as a T12 housing ( T12 ) K. Be removed before installed into fluorescent bulb sizes t8, t12 fixture pin/recessed double Contact between different manufacturers ) fluorescent tubes is the way! And an R17d cap on each end marketplace that was exploding with the B meaning `` ''... Into 8 to translate into inches effect that it has the possibilities of fluorescent,. With 5 mm spacing ), grooved tube shape and an R17d cap on each end 8 years type... And sockets, see light work on a T12 the T gives the diameter of tubes! Who engaged in LED lighting for 8 years ratings for general lighting for blacklight-blue lamps a. Had was so old tube and the T8 ’ s changed is that color temperatures became more precise over.! Codes for the amount of light as a T12 … fluorescent bent lamps come in a 2x2 troffer often... 38Mm ) has ceased on an instant start or a program start rendition! Used to this day will be approximately 85 Contact / about Email Returns... Hogging fluorescent tubes tubes replacing even the T8 is 1 inch in diameter most!