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I use a small 500watt oil heater in my lung rooms and with a dehumidifier and 320 watt fixtures @ 100 percent power which provides just...

Its accuracy may be questionable but it would still help you adjust light height above canopy and intensity that and observing plant...

Having a device to measure ppfd is the best way to know light distance intensity etc i highly recomend a UNI-T btu lux meter ive been...