1400ma vs 1750ma

Vonkins

Vonkins

Well-Known Member
4×8 20 cxb 3590 3000k 90cri 5 hlg 240-1750 drivers and dimmers. Should I dial them down a little. Is there any noticeable difference in the 2 other than your damn light bill. Basically will I get fatter nugs at a higher light intensity. That's always been my thoughts. Maybe u can have too much light. My ladies don't think it's too much but I'm sure my electric bill will show the difference. No point in useless watts!
 
Vonkins said:
4×8 20 cxb 3590 3000k 90cri 5 hlg 240-1750 drivers and dimmers. Should I dial them down a little. Is there any noticeable difference in the 2 other than your damn light bill. Basically will I get fatter nugs at a higher light intensity. That's always been my thoughts. Maybe u can have too much light. My ladies don't think it's too much but I'm sure my electric bill will show the difference. No point in useless watts!
Click to expand...
I say it's always better to have more and be able to dim, then need more and have no flexibility.
 
Vonkins said:
4×8 20 cxb 3590 3000k 90cri 5 hlg 240-1750 drivers and dimmers. Should I dial them down a little. Is there any noticeable difference in the 2 other than your damn light bill. Basically will I get fatter nugs at a higher light intensity. That's always been my thoughts. Maybe u can have too much light. My ladies don't think it's too much but I'm sure my electric bill will show the difference. No point in useless watts!
Click to expand...
theres a lot of different things to consider. cob spacing, height from canopy, canopy depth, plant spacing, etc.

if you want to dial your electric in a light meter would pay for itself right quick

and this

Airwalker16 said:
I say it's always better to have more and be able to dim, then need more and have no flexibility.
Click to expand...

if you design your setup for 1400 mA. the extra 25% will definitely come in handy at some point, and its just a little more cost in drivers. easier than building out 25% more cob rig if youre not going to use it all the time
 
Someone run 2x COBs at (x-total power) vs 1x COB at (x-total power)
Would be fun to see if multiple point source and less intensity can keep up with single point source at greater intensity.
 
wietefras said:
None of that is related to boosting (undimming) the driver from 1400mA to 1750mA though.
Click to expand...
sure it is.
1750 mA spread out over 25% more area should give similar results to 1400 mA plus about 25% more relative yield to
1750 mA vs 1400 mA over the same area will likely yield less than 25% more and it might have diffferent results (density at top and bottom of canopy, etc)
 
There will be 25% more electricity used. The lights will be less efficient at 1750mA so you wont get the full 25% extra in light, but instead around 20% more light. The plants also tend to get less efficient when the light intensity goes up goes up. I did a bit of analysis on this a while ago based on the YOR database of grow results. Around the 700 to 800umol/s/m2 light intensity range, on average the yield would increase by around 14% when the light is increased by 20%.

So 25% more power would on average give you around 14% more yield. Giver or take a grain of salt :)

CobKits said:
sure it is.
1750 mA spread out over 25% more area should give similar results to 1400 mA plus about 25% more relative yield to
1750 mA vs 1400 mA over the same area will likely yield less than 25% more and it might have diffferent results (density at top and bottom of canopy, etc)
Click to expand...
The question was about increasing mA on a COB fixture in a set grow area. The COBs are fixed to a frame and are distributed evenly over the grow area. Whether you set the driver to 1400mA or 1750mA isn't going to change the COB spacing since they are fixed as is the room. You also don't need to change the height since the uniformity of the light distribution is what dictates height and that doesn't change by increasing the amount of light. It has no bearing on plant spacing since it's the same room. etc etc etc.
 
right but without knowing the details how can you assume the starting point is 700-800 ppfd? for all we know it could be boosting it from 500 to 625 ppfd or from 1000 to 1250. so its hard to lay a rule of thumb on how much adding 25% will yield. can be anywhere from 5-22ish% really
 
I've noticed under COBs, that I get the little weird growth at the tops of the highest buds. No bleaching, but like a little patch of lime green salad top. I've chalked it up to distance from the emitters (14 inches)

I've had success running cooled hoods (cool suns w8" ports) right on top of girls where the glass was touching the flowers. Extreme bleaching would occur sporadically which would suggest to distance them more, but I am not so sure that it isn't the heat from the light causing the bleaching and not the intensity of the light. *traditional HID lighting
 
Last edited:
With COBs or something else?

Last grow I had some tops as close as 4" to a 50W COB. Didn't seem to bother it at all. I did a whole grow with the distance of the whole fixture at 8" and that went fine too. Although I do like 12" better.
 
CXB3590s, The gals don't seem to mind the proximity to emitters. I've just noticed the very top/peak 1/8-1/4" growth to look kinda veggy. And I've seen this on a few different varieties. Many might not even notice unless you pay attention.

Basically, I've been able to smash the COBs right on top of the ladies, with zero bleaching a of yet. I run line-arrays which are madeup of 5x 3590s 3500K @ 1500mA, active cooled, emitters spaced ~5" off center. It's intense.

sorry I edited the above post, only bleaching I've experienced has been under traditional HID HPS/MH
 
I've not experienced bleaching with the COBs either. I did with a 1000W HPS which was way too close to the plants (didn't have enough height in the tent)
 
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