These T5 VHO (Very High Output) lamps are a brand new technology. T5 HO (High Output) lamps have an initial rating of 5,000 lumens. The new VHO lamps are 7,200 lumens. They have to be paired with a VHO fixture such as the Solar Wind®, Sun Blaze® VHO or Solar Flare. Minimum order of 5 at this time.