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CDM (Ceramic Discharge Metal-Halide) lamps give out an intense full spectrum light that plants love. It’s not wasted either, in return your plants will give you crops with far superior quality, incredible taste, smell and more essential oil production! Watt-for-Watt, CMH grow lights can produce larger yields than HPS. Some growers speculate that 315 watts of CMH can give yields equivalent to 500 watts of HPS light. CDM grow lights also give off some light in the ultraviolet range (UVA and UVB) which is the reason for the superior quality of the crops that they grow.