Lighting-Gallery.net
General => General Discussion => Topic started by: halofosfaatti on November 02, 2018, 05:38:20 AM
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I have wondered when they come out.
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I think during the 80's: http://www.lamptech.co.uk/Documents/FL%20Gases.htm
The Americans also have T8 tubes, but they are completely different lamps than ours.
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Ok. What is the differences beetween European and American tubes?
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European T8 have krypton buffer gas, and intended to replace T12 on their series chokes. They are available at 18W (For 20W T12), 36W (For 40W T12) and 58W (For 65W T12).
American T8 have argon gas, and requires a dedicated ballast for them, and aren't intended to retrofit for T12 lamps on their ballast (Otherwise they would be overdriven). Available in various wattage ratings, most commonly 32W, which have the same length as 40W T12.
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GE started making T8 even back in it Heyday
anyway the 32 watt and 17 watts lamps came out
in early 1980s. but preheat T8 been around. for a good
while.
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Ok.
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The F15T8 and the F30T8 were the first two commercially available fluorescent lamps. They were invented as we know them in 1934 and were put on the market in 1938. The F20T12 was next to follow and then the F40T12. All of those ran on preheat circuits.
I believe in the USA, when they came out, you needed to use 220V for the F30. Within a year or two, autotransformer ballasts became available for 110V applications. (Those mains voltages were the North American standard before being raised to 120 and 240.)
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If 15w t8 was there right from the beginning what was the point of 15w t12 lamps?
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The T8 18/ 36/ 58W came around 1978. Later in the 80s other wattages in T8 format like 14W/ 23W/ 36W-1m/38W and 70W were introduced to replace T12 format of 14W/ 25W/ 40W-1m/ 42W and 75-85W(british) tubes.
The 15W and 30W T8 Ar- buffered tubes were on the market since the beginning.
For the european U shaped tubes like those from Osram GmbH the change to T8 was in the mid nineties.
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I don't know about the 14W, 23W, 36W-1m and 38W T8s and the 14W, 25W, 40W-1m and 42W T12. I know that the British only have the 70W T8 that retrofits 75-85W T12 and the 100W T12 which retrofits the 125W T5.
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Some sources say that T12 tubes do not need very pure and expensive phosphors that T8 tubes need (due to proximity of arc?). Newer triphosphor mixtures are not very sensitive to the arc, but they are more expensive and using T8 helps to reduce costs and achieving needed electrical characteristics.
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T8 uses the same phosphors as the T12. These are the long T5 and the CFLs which requires the triphosphors, since they operates at much higher loading than T8 and T12, so the halophosphors would fade much faster on them.
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Oops. I meant 125W T12, not T5.
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I first remember seeing T8 tubes here in the late 60's/early 70's, my next door neighbour who was an electrician had one in his living room. I thought then that they looked weird compared to T12's, which I still think are the best tubes ever, especially the BC capped ones ;D
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Oops. I meant 125W T12, not T5.
Dor, there was in fact a T5 tube available with 120W as well a 95W version. Both of them were introduced onto the market by Philips as high bay VHO lamps after the 2008 light& building fair. 8)
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The earliest retrofit T8 I ever found was a Philips TLD18W/83, made in November 1978 - now FORTY! Philips started them off in Triphosphor 83 and 84 before extending the range in 1980/81 to include Halophosphate colours, so as not to miss out on the market opened up by Thorn and Osram for traditional colours in Retrofit T8.
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Don’t know what the german Osram did but I haven’t seen any T8 retrofits from that time era. I think that they started to offer them later than Philips. For example Philips did offer the colour 82 (827) very early while Osram intorduced the same colour known as Lumilux Interna in 1985. Before that they still had the Interna 39 colour in T12 format in their portfolio.
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然而T8管在50年代南京电子管厂生产过10W的并将它们出口到日本，当时我国主要还是使用T12 15 20 30 40W的，T8大规模应用与中国应该是在20世纪90年代中期，我家原来的灯就是T8 30W的，安装于1999年。
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So far I know Osram (factory Eichstätt/Germany) presented the 26mm T8 flourescent tube jan. 1978 for 35W T8 instead of T12 40W and 60W T8 instead of 65W. July 1978 presented Osram and Philips new T8 lamps for the market 18,36 and 58W. They wrote the lamps will be saleable in January 1979. GTE Sylvania Frauenaurach (Germany) presented for the market these typically T8 lamps in April 1979 with black end caps.
@TL8W: Where comes your 18W TLD of 1978 from? Has that lamp the brass end caps?
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So far I know Osram (factory Eichstätt/Germany) presented the 26mm T8 flourescent tube jan. 1978 for 35W T8 instead of T12 40W and 60W T8 instead of 65W. July 1978 presented Osram and Philips new T8 lamps for the market 18,36 and 58W. They wrote the lamps will be saleable in January 1979. GTE Sylvania Frauenaurach (Germany) presented for the market these typically T8 lamps in April 1979 with black end caps.
@TL8W: Where comes your 18W TLD of 1978 from? Has that lamp the brass end caps?
There we go. 8) Thanks for the info Michael, do you have some literature available about these lamps?
Speaking of the Sylvania Energy saver tube, I use to have one black ender in my collection but it was dead.
For the TLD 18W tube, I think that it would be a little late for brass ended tubes for 1978. But it most likely would have crimped ends like all T8 before 1980/81?
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@Bidi: Sent you a mail. Just noticed I forgot the Philips ad :-[ ..
There in the ad the lamp had the same end caps like todays Aura lamps: http://www.auralight.de/wp-content/uploads/2012/10/Protector-Ultimate_1000px.jpg
I meant these caps.
The Sylvania ad is the oldest one I found with 26mm diameter flourescent tubes in the standard wattages.
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When did the modern T8 fluorescent lamp came out for the US market? GTE Sylvania introduced the F32T8 Octron line in August 1981. Then Westinghouse followed suit shortly after with the Octolume line. GE was late in the game, the Trimline (now Starcoat) line came out around 1988-89.
The 18w and 36w T8 line you guys are talking about is not widely used in the states. Reason, most of our F40T12 ballasts are rapid start and they can't start krypton filled T8 lamps because the starting voltage requirement is higher in these lamps than RS ballasts could provide. Also the thiner tube diameter is farther away from the grounding fixture surface, which aids in lamp starting. Instead, we got the 34w 4 feet T12 and 60w 8 feet T12 energy savers.
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When did the modern T8 fluorescent lamp came out for the US market? GTE Sylvania introduced the F32T8 Octron line in August 1981. Then Westinghouse followed suit shortly after with the Octolume line. GE was late in the game, the Trimline (now Starcoat) line came out around 1988-89.
Did the first Octrons have black ends or already aluminium? Interesting that in the States the T8 energysavers were introduced later than in Europe.
The 18w and 36w T8 line you guys are talking about is not widely used in the states. Reason, most of our F40T12 ballasts are rapid start and they can't start krypton filled T8 lamps because the starting voltage requirement is higher in these lamps than RS ballasts could provide. Also the thiner tube diameter is farther away from the grounding fixture surface, which aids in lamp starting. Instead, we got the 34w 4 feet T12 and 60w 8 feet T12 energy savers.
Such tubes weren’t available in Europe. The T12 are/were always full wattage.
The other way round on our VHO tubes the wattage was being increased like for example the original 120W 5 feet tube became 140W and the 100W 4 feet tube was later sold as 115W. Both were then stated as “Double Flux”.