lamps have the lowest efficacy of the HID family, which ranges from 30 lumens per watt for the smaller- wattage lamps to 65 lumens per watt for the larger-wattage lamps.

Question

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Mercury vapor lamps have the lowest efficacy in the HID family, with a range of 30 to 65 lumens per watt, compared to other HID lamps like metal halide and high-pressure sodium, which have higher efficacies.

Lamps Have the Lowest Efficacy of the HID Family, Which