There are the
LED black box units you can get pretty cheap off of amazon and eBay. They used to be sold under Taotronics and have always been highly recommended due to price and reliability.
I have run both radions and ai over my tanks and haven't had any major issues outside of one radion power supply dying, but it was under warranty and they sent me an entire new generation radion.
EDIT: I should also add these type of units will cover roughly 2 ft of tank length.