This is actually a marine reef hood with lights and fans but can be used as a grow light as well. It hosts 4 bulbs but the 2 outer bulbs are burned out and need replaced, the 2 center and main bulbs work fine. Center bulbs are Enviro lite xpz 110/5u 125w 1800ma 10,000 hour and both are newer, the 2 outer bulbs are act03 96w, they clip into brackets on both sides fast and easy. 2 fans positioned on each end of hood model uf-12a12 w/ball bearings, excellent fans. The hood measures 12 1/4" x 37 1/4"