Adding functionality to my Mopar/Jeep shop

I bought some cheap 4' T12 fixtures like $10 a piece understanding that they had about a 50 degree start temp but it was like 70 degrees out today and one entire circuit will not start. I figured it was the circuit but it is working fine. I have a furnace in that area so I wasn't worried about the start temp ongoing but they stopped working before I got he furnace running. I tried to start them in about 20 degree weather. Did that kill them? at $10 a piece I am ready to cut my losses and buy something of better quality.