Have you heard? Over 2020 one of the best LED grow lights has been the #HLG225. Not only does it replace a #CMH315 but destroys it in every category. For one there is no bulb that needs to be replaced annually which is necessary for a CMH315 lamp. You buy the HLG225 once and you’re set for ten years. Even if the two lights had equal outputs, by time you are in the third year of your warranty on the HLG225 you would of had to buy two to three bulbs at $100 bucks each to keep the CMH315 running. The real advantage with the HLG225 is the fact that at 18” your getting over 900 PPF, verses the CMH315 burning or bleaching plants at that height. Electricity in Massachusetts runs around $28 a month for the HLG225 compared to $38 on the CMH315, it simply is a no brainer buying a HLG225. They also work great for vegging a 4x4 foot area and is one of the most affordable lights made by Horticulture Lighting Group, our modules are built by Samsung and the lights are made in the USA.