Search:

Problem with smaller screen, is you lose light.

Can't add dimmers to these; dimmers must be built in. Just use a cloth over half the light.

I'm not sure if they would melt acrylic; you could...

Welcome from Australia.

Although most China lights only actually have about 2/3 of the wattage they state, the 120w one is still way to much. You don't say how much you feed, but probably 3 to 5...

I bought the $20 Chinese "IP65, 20w" light from ebay, and cycled it on and off many times per day for a few weeks. Then I took it apart and did some measurements. I removed the power supply for the...

Nice new option:
http://www.ebay.co.uk/itm/291399671385

A new clip-on option:
http://www.ebay.com/itm/161252647371

Summary of links:

http://www.htgsupply.com/Product-LED-Spotlight-Bulb-TriBand-Spectrum---ONE.asp
...

Welcome.

Those LED bulbs should be good. Your current 18 watt CFL is way too small for a 88 square inch screen, and could use 2, 3, or 4 of the LED lights, preferrably on two side (2 bulbs each...

A new good one...
http://www.expressions-ltd.com/Algae_Scrubber_LED_Light_p/led-grow-light.htm

I think so it is if not too close. The single LED might be too strong if very close, which is why the ones I linked to before (with multiple LEDs) might be better because they are more spread out and...

More good ones:
http://www.ebay.com.au/itm/12W-40W-60W-100W-LED-Grow-Light-Lamp-2W-Chips-flower-plant-herbs-vegetable-/221307240090?pt=US_Hydroponics&var=&hash=item791d9386f3

These seem to be good too:
...

Yes it does.

That's the best one I've seen yet. 13 LED watts, and it's spread out over a wide area.