Thats one thing i can say about CV,there customer service is second-to-none.They have already replaced this bulb when they re-designed the old 250wCV10k(too much UVB).If I like this new XM bulb I'll sell the new CV10k when it arrives,If not,I got a brand new bulb for the next yr.The CV really brings out alot of color in my SPS but the newly designed bulb they sent me doesn't have the PAR or white/w a hint of blue spectrum like the old one.Growth hasn't been great but alot of that is my laziness in keeping calc/alk stable.I have been getting good growth the past month since i've been monitoring it.