double just has an extra tube than the single one's...
So 2 single's = 1 double....1 double is cheaper than 2 single's usually so yea
s12fever Reviewed by s12fever on . what kind of lights im starting to grow and im going to use a fluorescent tube light for the vegatative but i dont if there is a special kind of fluorescent tube light i should use or should i just use an ordinary flo tube light that can be purchased at say a home depot? and how many watts should the bulb be? i am using a space of 21in length 21 inch wide and 33 in tall. thanx Rating: 5