Need a glass shield for halides?
Hi, and thanks for reading this….My question is regarding a 250 watt AB 10 K Mogul Bulb or any screw type metal halide bulbs…Do they need to be shielded because of UV rays or is the bulb case already producing the shielding effect ? < They do not need to be shielded. With the double ended bulbs it is a good idea, but for mogul base you are okay. > The reason I am asking is I wanted to maximize the amount of penetrable light into the tank…120 gal Standard Tank 19 inch water column after sand bed….Bulbs 9″ from water surface… < Yes, you do cut down on light when you add the shield. Therefore I try not to have a thick shield. I like using 1/8" glass. It isn't very thick but it shields. Plus, I would rather clean the salt creep from my glass, than from the bulbs themselves. So a glass shield also helps with maintenance.
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