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"40" sticker—400 watts (MV/MH/HPS/PSMH)—Very common "No" sticker [clarification needed] —600 watts (MH/HPS)—Lamps for commercial or industrial lighting are so rare that there isn’t any NEMA sticker. Most 600 watt HPS lamps are used for growing. "70" sticker—700 watts (MV)—Very uncommon "75" sticker—750 watts (HPS/PSMH)—Uncommon
All HID grow lights require an electrical ballast to operate, and each ballast has a particular power rating. Popular HID ratings include 150W, 250W, 400W, 600W and 1000W. 600W HID lights are the most electrically efficient as far as light produced, followed by 1000W. A 600W HPS produces 7% more light (lumen-per-watt) than a 1000W HPS. [22]
The setup includes a carbon filter to remove any odors, and an exhaust system to cool the bulb and prevent the HPS from heating up the tent. Air from inside the tent is drawn through the carbon filter and over the bulb, then is exhausted out through the ducting using a powerful exhaust fan. Plants would be placed at the bottom of the grow tent.
High-pressure sodium lamps are quite efficient—about 100 lumens per watt, when measured for photopic lighting conditions. Some higher-power lamps (e.g. 600 watt) have efficacies of about 150 lumens per watt. Since the high-pressure sodium arc is extremely chemically reactive, the arc tube is typically made of translucent aluminum oxide.
The luminous efficacy of a typical CFL is 50–70 lumens per watt (lm/W) and that of a typical incandescent lamp is 10–17 lm/W. [38] Compared to a theoretical 100%-efficient lamp ( 680 lm/W ), CFL lamps have lighting efficiency ranges of 7–10%, [ 39 ] versus 1.5–2.5% [ 40 ] for incandescents.
[9] James Watt and Matthew Boulton standardized that figure at 33,000 foot-pounds (44,742 J) per minute the next year. [ 9 ] A common legend states that the unit was created when one of Watt's first customers, a brewer, specifically demanded an engine that would match a horse, and chose the strongest horse he had and driving it to the limit.