Reef One Baby biOrb Replacement Bulb contains a 5 watt halogen bulb. The baby biOrb aquarium light unit should last for around 1200 hours. We recommend leaving the light on for 6-7 hours a day to simulate a natural environment for your fish.The Baby biOrb bulb must be replaced with the correct Reef One 5 watt 12 volt bulb. Larger bulbs may have an adverse effect on the light unit and Baby biOrb.Always use official Reef One bulbs when replacing your...