Ultra Ace conversion lamps are HPS lamps that operate on Metal Halide systems. Transforms a one-dimensional Metal Halide lighting system into a complete growing system. Provides optimum Red spectral energy required for flowering. These lamps are environmentally friendly and pass EPA, TCLP test criteria as non-hazardous waste. Environmentally Friendly EN lamps are Environmental Protection Agency/ TCLP compliant as non-hazardous waste in that they are completely lead free and contain 80% less mercury than standard HPS lamps. The environmentally friendly lamps (EN) can usually be disposed of without being recycled, however please check with your state laws first, which may be more strict than Federal law. For information on how to recycle your lamp visit www.lamprecycle.org. Initial Lumens: 25,000 Glass Size: BT-28 For use in 250W Metal Halide fixtures.