The 70w HPS security lights they sell at box stores have a built-in ballast, that's why they are so heavy... just read the box, it will tell you.
stinkyattic Reviewed by stinkyattic on . Hps? I took a trip to my local lowes today. I was wondering if I would have to get a ballest for a 70watt hps light. I have just been using cfl's to do my growing. I was going to grab a small hps light to get thicker buds but I don't have the money to get the ballest as well. I was thinking that being under the 100 watt max of my ballest that I can add 2 more lights too if I could us a 70 hps in there. much love and keep growing and :smokin: Rating: 5