Quote Originally Posted by seventhchild
does adding glass between your bulb and plants reduce the amount of light received by your plants? it seems like i read that somewhere ....anyone have more info?
That is true, but to compensate, you can move the bulb/tube closer without any heat (so long as you have ducting and fans), so it makes up in terms of light output, since it can be moved closer. Lumen loss will be about 8% at the same distance, but move it 2 inches closer, your back in business. Just be sure to keep the glass as clean as possible and you should be fine.