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Ask-a-Grower #157 – How much will 1 light cover?

What is the grow area one light will cover? I know it depends on the reflector/bulb wattage, so here is my scenario…My grow area is 5ft long x 2ft wide with an 8ft ceiling height. Would a 600watt HPS with air-cooled rectangle shaped reflector be enough for the 5ft of length? Or should I use 2 400watt HPS with similar reflectors side by side to cover the length? I plan to use 1sqft of space per plant, 2 rows of 5 plants totaling 10 plants.

You can do it either way.  The 600w optimum spread is about a 4×4 max. The 400w has an optimum of 2.5×2.5 or 3×3.  So, my recommendation would be going with the 2- 400 watt lights. You get more light and more light sources.  I hope I have answered your question to your satisfaction.  Please call 619.796.1857 or email ask-a-grower@128.199.117.192 if you have any more questions.