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my m8 reckons the blue are for veg only and the red for flower, he has both. the reason being is that they both give out a slightly differnt spectrum of light? hes done 2 grows with them and they both turned out ok. he also mentioned if u get them get the 8u as the 3-4 u dont have that many lumen's. i also read somewhere you must have the red spectrum in the veg stage aswell . you can buy the led boards off ebay pretty cheap, they have blue,blue/red and red ,if you read the description it should tell u more there .
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