Hi Ebs..just a quick question about the e-glass...how did you put that glass in. I am new so I am unsure..but read alot about being careful abou the uvradiation. Is it on top of tank? does it avoid the lighting getting water splash..sorry if questions are dumb...I am just a newbie girl here...lol
Lennon- Not a problem, no stupid question as far as I'm concerned. The low-e glass is just a type of glass that is manufactured that doesn't allow penetration of uv rays. It is probably in most of your house windows/car windows etc. You can have a piece cut to whatever dimensions you need and it isn't too expensive. Most glass stores carry it. But before I get into how to install it, first do you have MH bulbs? If you do then are they double ended, i.e. not a single mogul screw in type bulb? The only time you will need this type of glass is if you have the double ended type MH bulbs as they do not have the uv glass built into the bulb. The single mogul type base bulbs already have the protection built into the bulb. So, if you have the double ended bulbs then you will need some sort of uv protection. I had a piece cut for the length and width of my canopy and the class covers the entire bottom of the canopy. The bottom edges of the canopy fold over to allow the glass to slide in from the sides and there is a middle brace to ensure the glass doesn't fall out. I wouldn't recommend placing the glass on top of the tank like tank lids because of trapped heat and no way for gasses to escape from the tank. Instead I would attatch the glass to your canopy. My canopy hangs from the ceiling about 8 inches from the top of the tank. I'll include a picture for you.
Another way to install the class is to enclose the bulb with the glass. Basically instead of enclosing the whole canopy, just enclose where the bulb is located. This might block some light because of parts necessary to attatch the glass.
To answer your last question, it does help in keeping water from splashing onto the fixture. Hope all this helped.
The second pictue is a diagram I drew for a previous thread on how to hold the glass to the canopy.