Output up to 3000lm, 3X of halogen bulb; Machine calibrated bulb ensure color precision | item include replacement bulb only, require Xentec ballast to work, ballast sold separately | all bulbs are sold in pair, some bulb size came without connector (h1,h3,h7,5202,880) | compatible with either 35W or 55W xentec ballast | Please check existing bulb size before placing order, partfinder may contain incorrect information