3000K or 3500K for flowering only (or 3000+5000 mix)

superbak3d

superbak3d

Well-Known Member
Just go look at RM3's journal.

See the evidence with your own eyes.

I can see an obviously visual difference when supplementing with cfls/floros.

Also keep in mind when using supplemental lighting like that, you're boosting your wattage per sqft, and (depending on your main light source positioning), you're getting a more even spread especially on the outer edges of the grow (if you're in a tent).

Needless to say, it's all usable light and will help in bud size and density as well.
 
KarmaPaymentPlan

KarmaPaymentPlan

Well-Known Member
superbak3d said:
purplebudz claims ALL cfls and floros put out next to zero UVB and are essentially pointless to run.

I will call him out for something so blatantly wrong and ignorant.
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:dunce::dunce::dunce:
PurpleBuz said:
standard T5HO cool whites (6500K) provide diddly squat for UVB.

dumb myths
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PurpleBuz said:
dude .....,

if you want UVB just use reptile bulbs even standard household CFLs have hardly any UVB.

did you not look at the SPDs that were posted earlier ?
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PurpleBuz said:
yes BUT you keep talking about household CFLs as if they actually contribute anything in the UVB range
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P

PurpleBuz

Well-Known Member
Airwalker16 said:
Some is better than NONE. And I use Spiral CFLs because apparently they give you more. But a reptile bulb from the pet store is your beSt bet for UVB
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superbak3d said:
Ignore purplebudz.

cfls and floros put out plenty of UVB. He doesn't know wtf he's talking about.
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bullsht, here are a whole bunch of SPDs for CFLs, http://ledmuseum.candlepower.us/led/spectra7.htm

now tell me where do you see a significant amount of UVB in a typical household cfl ?
For example .... 14w 6500k lights of America

loacfl1[1].gif
 
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Abiqua

Abiqua

Well-Known Member
superbak3d said:
Just go look at RM3's journal.

See the evidence with your own eyes.

I can see an obviously visual difference when supplementing with cfls/floros.

Also keep in mind when using supplemental lighting like that, you're boosting your wattage per sqft, and (depending on your main light source positioning), you're getting a more even spread especially on the outer edges of the grow (if you're in a tent).

Needless to say, it's all usable light and will help in bud size and density as well.
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are you high? seriously........Your eyeballs are terrible detectors, they lie! Nothing like inconclusive data to make a concrete point......
 
Rahz

Rahz

Well-Known Member
I can understand how the idea got started that 3000K isn't "good" for veg,... but it's a totally wrong idea. 3000K full spectrum LED works fantastically for veg.

Higher K emitters have slightly better efficiency. 3500K provides a small boost over 3000K and provides a more ideal ratio over 3000K in the red/blue department but when it comes to growing the effect will be slight to unnoticeable.

Still, we have choices. No reason not to use 3500K unless the chamber is dedicated veg in which case 4000K will provide a slight efficiency boost.

It's been shown that stem and leaf characteristics are affected by red/blue ratio, but again the ranges we're working with, effect is slight.

Bottom line is that 3500K follows the Mcree curve most closely and provides "enough" blue, the only better choice would be higher CRI, but at the expense of photons it's not worth it.
 
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