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Welcome Neil. You'll find lots of info around these parts.
There's more to it than this, and OPINIONS VARY but basically... Lower kelvin rated bulbs have a yellower color but they stimulate growth better (5,500kelvin to 10,000kelvin). Higher kelvin range is crisper white to blue, but they don't stimulate growth as much (12,000kelvin to 22,000kelvin). Some people combine the two: One for growth, the other to supplement the pretty color. Hope that's a helpful start. Somebody else correct me if I'm wrong.
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