i went thru a lot with those cheap shop lights and ended up with the better 8 ft units that would fire in the cold. the others would not no matter what they said on the box! so spend $20 bucks a unit or $50 for 8 ft now and save the aggravation. i think the better ones came with bulbs...this was for my new shop and corvair garage about 2 years ago. regards, tim colson all lit up now.