Ye exactly. Thanks for backing me up here. Any light is good enough if you got plants that require either that or that.A lot of poor generalizations being thrown around here. Here is an example of a tank I had with nothing more than two 9 watt 6000K CFLs over it. Zero ferts. Zero CO2 added. It depends what plants you have and how close they are to the light source to name just a few things. This was a 10g setup I had some years ago. The light could look like absolute crap to the human eye. If it's pumping out radiation your particular plants can use is all that matters.