Flowring light : 3500k or 3000k?

Sampagani · Oct 26, 2020

Hi everyone!
So my babies (2 Northern Lights Auto and 2 Bruce Banner auto) start the flowering phase, so I must change the light temperature from 6500k to 3000k!
I choose the led so there is two options :
1- 18w x 3 (135w x3), 1600 lumens, each, 3000k each.
2- 45w x2 (338w x2), 3500 lumens each, 3500k each.
Which is better please?
I want to buy the second one but I was wondering if the 500k difference between the 2 choices will make a difference in the harvest and yield?
Many thanks.

growsince79 · Oct 26, 2020

Color won't matter as much as lumens. Neither option will work very well for flower. You need more light.

Terpz719 · Oct 26, 2020

In terms of flowering, you want the 3000K, but as growsince79 said you need more light. Figure at least 35 actual watts per square foot of canopy for vigorous growth and good flower development.

growsince79 · Oct 26, 2020

Terpz719 said:
In terms of flowering, you want the 3000K, but as growsince79 said you need more light. Figure at least 35 actual watts per square foot of canopy for vigorous growth and good flower development.

Hlg claim the 100w (25w/sqft) will be enough to flower 2 x 2. I'm testing now. 3 weeks from harvest, I can report that imho that's not quite enough. 3 of them would be perfect in a 2 x 4. 300/ 8=37.5w/sqft. That would be perfect.

Terpz719 · Oct 26, 2020

growsince79 said:
Hlg claim the 100w (25w/sqft) will be enough to flower 2 x 2. I'm testing now. 3 weeks from harvest, I can report that imho that's not quite enough. 3 of them would be perfect in a 2 x 4. 300/ 8=37.5w/sqft. That would be perfect.

I agree. FWIW, my setup (no CO2) comes out to around 43w per, and I've been happy with the results.

growsince79 · Oct 26, 2020

Terpz719 said:
I agree. FWIW, my setup (no CO2) comes out to around 43w per, and I've been happy with the results.

My setup was 2 x 150whps + 100w mh. Replaced one hps with hlg. Will buy another and run 2 x 100w hlg with 1 150w hps or 100w mh between them. I don't think 2 x 100w hlg is enough for 2 x 4.

Sampagani · Oct 26, 2020

thanks a lot guys!
I'll buy tomorrow a HPS lamp and make the setup!

Flowring light : 3500k or 3000k?

Flowring light : 3500k or 3000k?

Sampagani

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