Cheap LEDS are most often less efficient than HPS or CMH. You can get something cheap but it will cost you on your electric bill. Or you can pay more and buy a COBS or quantum boards. I like my COBS. They are water proof built like tanks and are dimmable.I'm not trying to grow the best bud in the world or sell to a dispensary or win world records. It's just very hard to believe that one of those lights wouldn't even cover a 4x4.