Scott, your fixture came with Coralife MH
bulbs as did mine. I replaced them with cheap eBay bulbs in January (10k). I don't have a meter to check them but the corals I got from Ziggy are doing great under them. I'm considering replacing them at the end of June (6 months) instead of waiting a year like I did with the Coralife's.
My eBay bulbs were like $10.00 vs. $60.00 each for the name brand bulbs. Replacing 3 bulbs every 6 months vs. a year is worth it to me for the $150.00 savings.
Next bonus I may buy a light meter