Do you think...
 

Do you think that a "Coralife 3/4W LED Lunar Light " Would provide any effect at all over a standard 20g tank?

Thanks.. want to get this if it would have an effect at all.. I miss moonlights.

I used to have two of them over my 10 gallon. They are ok, but give a real "spotlight" look.

I have a 1 watt over my 15, I get about 60% coverage with it being a few inches up from the surface and at a 45 degree angle. I wish I had gone with two 3/4 watts but I got a grea deal from a fellow reefer.

Considering the focus if you want full overage you're going to have to keep it a foot above the top or diffuse the light somehow. A scuffed up (sandpaper) piece of glass or acrylic might make a good lens for that.

Thanks. I think I'll try it out ... even if it's not that great, I am sure it will give off some effect.

Thanks. I'll let you know how it looks

It looks great. I taped it to the top of my fixture, which is tall.. and it spreads very nicely throughout the tank. I'll take pics soon.. I don't know if they will turn out well though.