FWIW, a guy who frequents the forum site RDO was using E-bay bulbs and was quick to defend them as being a great bulb for the price. His corals were growing and he was happy. After enough badgering form fellow reefers he sent a couple of the bulbs to Sanjay for spectral analysis and PAR testing. The bulbs came back with VERY poor PAR results. The reefer has since switched to the more expensive brand name bulbs ranging from 50-75 dollars. As much as he (and all of us) wants to save money, he also want his tank inhabitants to thrive rather than just survive
YOU GET WHAT YOU PAY FOR......