CXB3590 290W - how much light to use?

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yosim

Well-Known Member
Hi, i think I am providing my plants with too much light, seeing some weird symptoms, I have 6 x CXB3590 in a 75 x 75 x 200cm tent,

is there any device to reliably measure the light intensity? I have an adjustable dimmer on the power supply, I have measured the power draw from the wall at about 290W from memory
most of the time i will have the potentiometer at about 12 o clock position - is there a certain wattage then maybe i should be aiming for? thanks
 
go go kid

go go kid

Well-Known Member
yes the are meters. the ones used for cameras (phatography)are good
ythis one is for cannabis growing. no idea if its any good. wa1595105617427.pngit for a member who knows about these things. but here is the meter
 
Y

yosim

Well-Known Member
BobThe420Builder said:
Pics help of the plants
Click to expand...
please see here

Severe leaf curl

Anyone know what causes this?? Every single grow no matter what strain I thought maybe it was magnesium deficiency so have been adding some canna mono 1ml/L since the start of this grow but doesn’t seem to make any difference These leaves will eventually die but I’m only 6 weeks into flower
rollitup.org
 
jeepster1993

jeepster1993

Well-Known Member
I use that same setup in my tent. 6 Cree 3590's running off a meanwell 320 watt driver.
My tent is larger though, it is 3x3x6(91x91cm)
I use it dimmed about 25% during the veg, then turn it up to full for flower. But you gotta keep the light away from the flowers as it will cook them, 6 inches anyhow, a foot away is better..

I would not want 55-60 watts a square foot, that is VERY high. 45-50 w/sq ft is better.
 
1

1212ham

Well-Known Member
yosim said:
Hi, i think I am providing my plants with too much light, seeing some weird symptoms, I have 6 x CXB3590 in a 75 x 75 x 200cm tent,

is there any device to reliably measure the light intensity? I have an adjustable dimmer on the power supply, I have measured the power draw from the wall at about 290W from memory
most of the time i will have the potentiometer at about 12 o clock position - is there a certain wattage then maybe i should be aiming for? thanks
Click to expand...
320-380 watts/square meter is a common recommendation with good white LED. I'm not sure of the efficiency of the CXB3590's, but around 35w foot should be ok for flower and around half that for veg. A cheap Lux meter can be useful. Good info in this post, but read the others!

Slow yellowish growth under vero 29 3000k/3500k

https://imgur.com/a/uLLbG Updated pics, lights on and off with camera flash. Turned down the lights to 200 watts total and they are 22" above the canopy... I wanna say the clone looks slightly better (back right) but the one on the back left is still pretty light colored with some curling...
www.rollitup.org
 
Y

yosim

Well-Known Member
jeepster1993 said:
I use that same setup in my tent. 6 Cree 3590's running off a meanwell 320 watt driver.
My tent is larger though, it is 3x3x6(91x91cm)
I use it dimmed about 25% during the veg, then turn it up to full for flower. But you gotta keep the light away from the flowers as it will cook them, 6 inches anyhow, a foot away is better..

I would not want 55-60 watts a square foot, that is VERY high. 45-50 w/sq ft is better.
Click to expand...
thanks - think i'm afraid of not giving them enough light
 
Y

yosim

Well-Known Member
1212ham said:
320-380 watts/square meter is a common recommendation with good white LED. I'm not sure of the efficiency of the CXB3590's, but around 35w foot should be ok for flower and around half that for veg. A cheap Lux meter can be useful. Good info in this post, but read the others!

Slow yellowish growth under vero 29 3000k/3500k

https://imgur.com/a/uLLbG Updated pics, lights on and off with camera flash. Turned down the lights to 200 watts total and they are 22" above the canopy... I wanna say the clone looks slightly better (back right) but the one on the back left is still pretty light colored with some curling...
www.rollitup.org
Click to expand...
thanks gonna read this now
 
Y

yosim

Well-Known Member
jeepster1993 said:
If I were you I would not run them at full power. We both are right at 53 watts per cob and thats a lot. My tent is 25% bigger than yours and I am careful.
But..what you have can grow great flower!!!
Click to expand...
No I never have them running at full power - usually have the pot around 12 o'clock position but I'm pretty sure the pot does not scale linearly so i don't really know how much power the leds are putting out at this position - I need to hook in my power meter to the plug socket and measure the wattage at a range of positions
 
Y

yosim

Well-Known Member
another thing I've just remember from previous grow - my buddy said the buds "were running" up the colas and this may be a sign of temps being too high, I am seeing this strain do the same thing, big gaps between bud sites on the colas - so reducing light intensity and temp is more than likely what I need to do
 
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