GrowLite's specialized products for indoor gardening are unique and proprietary including their reflector design and bulb spectra. The OG Vertical Reflector and Karma Horizontal reflector both use streamlined air cooling technology for maximum light penetration and increased yields. The Real Red HPS and Tru Blue MH bulbs has optimized spectra for unparalleled plant growth output. You have to see it to believe it. If you're not 100% satisfied, GrowLite will give you your money back, guaranteed.