The link provided doesn't work for me but either case, I'd buy new bulbs... especially if you don't know the exact age of the bulb or if it is a good spectrum for corals. T5 bulbs need to be replaced annually anyways... with some that replace them every 9 months.
You can order them from bulk reef supply, just Google what a good 4-bulb combo is for your tank. You can't go wrong with ATI and Geisemann bulbs. I used to run a coral +, blue +, purple +, and another coral + back in the day but you may want to get more updated advice.