My partner uses them,,Leds that is they are not bad as is pointed out plants like light any light for the most part,,Light is like a rainbow ,,there are many spectrum's,, each a color,,I would use some florescent in the room as well ,,use full spectrum bulbs ,,these are called daylight bulbs ,,it is what photographers use as it is meant to be like natural light ,,you can get at normal depot type store in town ,, they cost me 34 bucks for a case of 10 bulbs almost cool to the touch,,great added light for all veg or any growth,,,Led do work but we use them as a added light not the main source ,,,,,,we do not have big enough lights to just do straight LED