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algae and light spectrum?


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so selecting a bulb spectrum with low or without red is the best choice, right?


No.. you need red in your light source so get correct color rendition. You should look for a full spectrum light source (nothing that is focused in one area) and keep your nutrient levels low to avoid algae. Even a 20K metal halide system (which is heavy in the blue spectrum) can grow algae with excess nutrients (phosphate and nitrates)

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