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Johnsly
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India - Member - Member working in Qatar

Join Date: Oct 2008
Location: Kottayam, Kerala, India. Now at Qatar
Posts: 10

Specification Of Light Fittings

11/18/2008 1:29 PM

What is this T3, T4, T5 etc of light fittings means? I think it is some specification indicating the length of lamp, anyway can u plz make it clear?
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Anonymous Poster
#1

Re: Specification Of Light Fittings

11/18/2008 1:40 PM

Sir, the "T" designation followed by the number is the diameter of the tube in 1/8 ths of an inch.

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Akihito Shigeno
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Location: Jakarta Indonesia
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#2

Re: Specification Of Light Fittings

11/19/2008 7:08 AM

Dear all,

T3, T4, T5 can be Temperature code for explosion protected apparatus for hazardous area. Refer to NEC Article 500, 505 or IEC 60079-14.

Regards

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NotUrOrdinaryJoe
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Join Date: Apr 2008
Location: Lexington, KY
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#3

Re: Specification Of Light Fittings

11/19/2008 12:12 PM

In tubular type lamps, especially but not always fluorescent, T means tubular and the number is eights of an inch. Length may or may not be part of the specification. For instance, an F40T12 is a (4 foot) 40 Watt fluorescent lamp that is 12/8 inches (1.5 inch) in diameter. But an F48T12 is a four foot (48 inches) fluorescent lamp that is 12/8 inches in diameter. Incidentally, it also has a different base (connection) and operates at 39+ Watts. Basically the same product but not interchangeable.

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