The white lights have a greater spectrum or “full spectrum” when compared to the “blurple” grow led lights.
I agree with others though, they’re not necessary for seedlings. Some T8 in 6500k should do just fine. The led T8 bulbs are fine also, just make sure to get the higher kelvin rating. 5000+. I’ve grown plants to maturity using the LEDs @ 3500K with no problem even.
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