Purchasing the most effecient Metal Halide and HPS bulbs

Does anybody know of any HPS or Metal Halide bulbs with a particularaly high lumen output per watt? Trying to keep the electricity bill low and still have a big yield. What is the best light to use if you are concerned with maximum yield per watt used. Thanks

eye hortilux. of all lights the 600w hps is the most efficient.

irieie said:

eye hortilux. of all lights the 600w hps is the most efficient.

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much appreciated ty