lens arc tube containment

[shputnik]

How can u tell if a fixture has a listed glass lens or plastic lens rated for arc tube containment? Is it safe to assume if it has a lense it is OK?

 

[John120/240]

What do the fixture instructions say ? If the lens is original to the fixture one would assume that it was listed for the application.

 

[don_resqcapt19]

What do the fixture instructions say ? If the lens is original to the fixture one would assume that it was listed for the application.

The requirement for a containment is fairly new. Older fixtures may not be able to contain a explosive failure of the MH lamp, even if they have a lens. There are newer lamps that have a built in containment, and they have a longer threaded base and the fixture has a matching socket to prevent the use of a lamp without built in arc tube containment.

As far as I know this only applies to Metal Halide lamps and not other types of high intensity lamps.