Originally Posted by
jar_lou
http:///forum/post/3119429
ok, I thanks for you input. And I have 500W of Metal Halide on the tank, along with 160w of Actinics. From what I have read, eggcrate actually lets more light through than glass lids. I am guessing because of the film that glass lids get after a little while of being used.
here is the link I as reading
Egg Crate vs. Glass Lid
TRUE egg crate is indeed better to use than a glass lid.
However, you need a piece of glass between the MH bulb and the water. Retrofit makes us have to put a piece of glass between the water and bulbs. However, full ready to use lights already have a piece of glass in place on the hood under the bulbs.
Even a tiny drop of water will burst a MH bulb. So it must stay absolutly dry. I burst a 2 day old bulb when I topped off once..it cost me $70.00 to replace the bulb. I learned my lesson.
A full glass lid with MH lighting, would create a greenhouse effect and really super heat the tank.