Halogen bulb T2.5 vs T3

[strnjss]

Hi, I just purchased a replacement halogen bulb for a fixture. What I didn't notice was the new one I got is a T3 halogen 150W bulb, and my old one was a T2.5 150W bulb.

They both look identical, they seem to be the exact same shape, length, ratings etc.

My first question is, what does the T mean? What's the difference between 2.5 and 3?

Also, can I use the T3 bulb I got even though my original bulb was a T2.5?

Thanks!

 

[Greatbear]

Double check the base of the bulbs. If they are the type with pins, the spacing of the pins could be different.

 

[strnjss]

Well, they look pretty much identical. I put the T3 into the fixture that the T2.5 came from, and it fit fine, it also works fine too.

They are J-type bulbs, like this:

both seem to have the same ends too.

There must be a difference between the two, but I just don't know what.


I wonder that the T designates?

 

[BTC]

I believe the T designates the bulb as tubular and the number is the diameter size in eighths of an inch.

 

[strnjss]

thanks that makes sense.