SE MH Glass Needed?

[Algae]

I've always heard that glass is required for DE MH fixtures to reduce UV radiation but not SE. I have SE mogul Lumen Bright pendant fixtures that I am installing that come with glass in place. Anyone have an idea of why? Needed?

[Kshack]

The glass is to protect the fixture from salt splash. Keeps the shinny metal much cleaner. Not necessary (from a UV standpoint), but nice to have.

[Algae]

The glass is to protect the fixture from salt splash. Keeps the shinny metal much cleaner. Not necessary (from a UV standpoint)' date=' but nice to have.[/quote']

 

That's what I was thinking! The large Lumen Bright pendants are usually mounted over 12" from the surface so there would be a reduced amount of salt vapor rising to the the reflector surface. However, after living next to the coast I know that any salt vapor will oxidize metal in even what seems like a somewhat distant proximity. I've also heard that the glass reduces PAR values by up to 15%.

[impur]

The UV shield is in the glass on SE bulbs, so you don't need the glass on the fixture

[Mitchell]

Check out this article: http://www.advancedaquarist.com/2004/8/aafeature

 

Here is an excerpt from that article:

 

"Aren't Mogul-base (Single-Ended) Metal Halide Lamps Shielded For UVR?

 

Yes, and No. The outer glass envelope surrounding the inner arc tube attenuates UVR but very poorly in many cases."

 

I would use UV filtering glass on all halides no matter if they are single or double ended.

 

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