If 3000k is good enough for QB, why don't we run them in T5s?

Pretty much the title - Is there a reason the popular advice is to run 6400k Veg -> 2700k Flower, or 6400k all the way through? Would it not be reasonable to suggest 3100K all the way through for T5 (provided you are not so inclined to just flip your bulbs)?

The specturm charts I look up (as flawed as the google search may be) seem similar to what the QB distribution is, (as I thought it should be) - so just kind of curious.

Thanks

You can use 3100K all the way through. You can use 6500K all the way through.

But light with more blue is more beneficial in veg and light with more red is more beneficial in flower, to put it very simply.

The k temp is not an accurate way to determine spectrum and the spectrum charts are all set to their highest relative peak without lumens (power) taken into account.

The power output pretty much determines yield. But the proper spectrum determines structure and growth patterns.

Blue heavy spectrum grows more leaves. Offers better plant health and keeps them more compact.

Red heavy indices stem growth and flower response.

Also too much blue in flower gave me leafier, looser buds and less weight.

Proper tools for what we need is a better way to look at it. There are so many variables.

All fair responses. I was just wondering if their was a specific reason for one and not the other. I expected as much here -

If I were to only select one color bulb for the entire grow, it would be around 3000K. The reason is that the plant is usually in flower much longer than veg. And the redder light of a 3000K source (~630nm and ~660nm) encourages flowering and budding.

friedguy said:

If I were to only select one color bulb for the entire grow, it would be around 3000K. The reason is that the plant is usually in flower much longer than veg. And the redder light of a 3000K source (~630nm and ~660nm) encourages flowering and budding.

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That’s a really solid point and it fits the head canon as well. Like was said above as well, the higher blue spectrum doesn’t promote as lush of growth in flower. Makes sense to choose a K temp in the redder spectrum, if your running one for the whole grow, for the same reason it is done with HPS.

I prefer mixed spectrum. I did it with t5 and will do it with led.

whitebb2727 said:

I prefer mixed spectrum. I did it with t5 and will do it with led.

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I have completed one with all 6500k T5HO lighting, one with mixed lighting all the way through (3-3/2700-6500), and am in the process of my third which will be all 6500k ( veg- all 2700k ( flower.

I will have decent evidence to see for myself how it affects really and I can share.

I was really more curious if there was a reason or if it was marketing talk and such