Once upon a time there was a light or a bulb for a shop light for growing chaeto in a sump. Anyone got a link?
I'm just using a clip on light with a 6500K CF bulb. Thinking of changing to a 15 watt LED spotlight though. http://www.homedepot.com/p/75-Watt-Incandescent-Clamp-Light-HD-200PDQ/205139241
I'm using an LED grow lamp from Amazon at the moment. I will let you know how it does. https://www.amazon.com/gp/product/B01MG7LVZE/ref=oh_aui_detailpage_o06_s01?ie=UTF8&psc=1