I just bought used GLO T5 high output 24 inch light. It came with no light bulbs. Previous owner claimed that it was a display light at local fish store and was never used. It looks brand new to me. I installed new T5 HO bulbs from zoo med. ligh fixture itself has no on/off switch. When plugged into power, it lights up only for 3-4 seconds and goes off. Is that sign of bad ballast?