Planted Tank Guru
Join Date: Dec 2012
Location: Hot Springs Ar. 71901
If you use it just flat on the glass I'd still place something between it and the glass to allow heat to escape, but mostly to keep harm from the bulbs. Anything that will keep the bulbs from touching the glass.
It won't be to much light but you may find it doesn't make the colors of anything stand out in any way.
The shortest distance between any two points is a straight line...in the opposite direction...