Waterfall Lighting power upgrade

[atoll]

I was getting a short dark sloppy algae growth with my 20w (run at more like 12w) LED's so I bought some 30w (run at more like 20w) Just finished installing them so hopefully I will start getting lighter longer GHA. The 20w were fine on my A5 size ATs but my new one is more like A4 hence the upgrade.

[SantaMonica]

Would be nice if the light were a little more spread out.

[atoll]

Would be nice if the light were a little more spread out.

The lights are about 4" from the screen and theyou easily cover the screen. I get even growth but so far the algae is not a nice, long and light green as it was when I had the 20w ones on my smaller screen hence why I have increased the power to these 30w ones.