I have researched this a bit. My understanding was that the 10 watts are okay for normal depth tanks. Deep tanks such as mine, a 125 would need the 20 watt ones. In my case I would need ten of them for a 6 foot tank so for that cost its not that great for me. When my cash flow allows I will be going with the aqua ray 2. Minimum cost for lights alone would be 270.00 I have not seen actual pictures of these led floodlights mounted only just heard of it being done.