Interesting little setup, who makes those?
I'm suprised that DE fixture has no glass below the bulb. Unless there is some other type of glass shield that i'm not aware of.
Glass on top of the tank is reducing light making it into the tank. I don't think it's alot, but we pay all this money for lights, may as well get all we can out of them. You can take the glass tops off, but you will have more evaporation. But with DE bulbs, you need a glass shield to block UV given off by these types of bulbs. SE bulbs have an outer glass shell which does this, DE do not. Some benefits can be better gas exchange, better cooling and less cleaning of the glass tops.



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