I beg you, do not purchase those square panels. They are not grow lights as advertised, in fact the LEDs at nearly 50nm from what can be used to grow. Also, you won't get as much light from them as the UFO or the Procyon 100. The Procyon is about the best on the market and it still isn't that great. Wait a while, LED is not yet useful enough for growing cannabis unless you dump loads of money into it just to get it started. If you want to grow with LEDs learn to wire your own board and use custom bought LEDs to ensure you are using to correct wavelength.