600w hps replacement - input and help would be appreciated

olsen

olsen

New Member
Hey RIU. I have been lurking these forums for a while and feel its time to pull the trigger on my first led-purchase.

I plan on running 8 Cree CXB3590 3500K hooked up to two HLG-240H-C1750B in a Homebox Q100(1 x 1 x 2 meters). It should give me something like 500 watts of light if I understand the numbers correctly, and I will add a potentiometer for dimming.

The diodes will be running bare without reflectors or lenses. For cooling i plan to order pre-drilled 160mm passive heatsinks from Kingbrite.

Is the Cree CXB3590 still a good choice? It´s a long time since this chip was introduced and I don´t have much knowledge about other manufacturers like Bridgelux or Citizen.

Please don´t hesitate to share any thoughts on this topic.

Peace out
 
CobKits

CobKits

Well-Known Member
olsen said:
Is the Cree CXB3590 still a good choice? It´s a long time since this chip was introduced and I don´t have much knowledge about other manufacturers like Bridgelux or Citizen.
Click to expand...
its fine but there are chips out now that are just as good at half the price. citi 1212 gen 6, luminus cxm22, and vero V7 all good choices for current models
 
thetr33man

thetr33man

Well-Known Member
Thats probably too much light for that size box. I think you could do very well with a single hlg-320h powering whatever cobs you decide on.

For example

1x HLG-320H-36A
6x Citizen CLU048-1212 90CRI 3000k gen 6

1212 3000K90Min 6 COBS @1500 mA
9 SQ.FT. CANOPY 94% EFFICIENT DRIVER @10 CENTS PER KWH
Total power watts at the wall: 347.88
Cobs power watts: 327.01
Total voltage forward: 218.00
Total lumens: 38874.30
Total PAR watts assuming 10% loss: 106.67
Total PPF: 576.00
PPFD based on canopy area: 688.89
PAR watts per sq.ft.: 11.85
Cob efficiency: 36.24%
Power watts per sq.ft.: 36.33
Voltage forward per cob: 36.33
Lumens per watt: 118.88
Total heat watts: 209.28
umol/s/W: 1.76 LER: 328.00 QER: 4.86
COB cost dollar per PAR watt: $0.67
Electric cost @12/12 in 30 days: $12.52
Electric cost @18/6 in 30 days: $18.79
Cost per cob: $12.0
Heatsink cost per inch cut: $0.66
Total cobs cost: $72.0

This is approximate, your actual power draw would be less but actual PPFD should be similar as this is based upon older gen5 cobs. Wiring in parallel is nice cuz if you drop a cob, your whole light wont quit working, the remaining 5 will just run a bit brighter, also you are less likely to kill yourself...
 
olsen

olsen

New Member
Thank you all for input.

I have tried looking around for Citizen grows and DIY guides, but Cree CXB3590 seems to be much more tried and tested. And its just easier for me to copycat Growmau5 and greengenes garden and order everything from jerry.

I want to get as much as possible out of my tent, and if I am not wrong there seem to be a trend towards using more light pr square meter than before?

Like greengenes CXP-420 using 420 watts on 6 cobs. Isn´t that more than 1.750 amperes pr cob? In most of the DIY videos I have seen before 1.4 A was recommended . Higher amperage should give me more vigerous growth and better penetration right?

I have also seen research reports stating that some varietes of cannabis can take as much as 1500 µmol and maybe aiming for something like a 1000-1200 µmol would be a good compromise?
 
CobKits

CobKits

Well-Known Member
olsen said:
I have tried looking around for Citizen grows and DIY guides, but Cree CXB3590 seems to be much more tried and tested. And its just easier for me to copycat Growmau5 and greengenes garden and order everything from jerry.
Click to expand...
crees have been used for about 2-2.5 years, citizens for less than 1. no differences in performance from anything ive seen, they all work fine

olsen said:
I want to get as much as possible out of my tent, and if I am not wrong there seem to be a trend towards using more light pr square meter than before?
Click to expand...
havent seen this trend, every garden is different. with efficient cobs you shouldnt need more than 35W/Sq ft. (375 W/sq m)

olsen said:
Like greengenes CXP-420 using 420 watts on 6 cobs. Isn´t that more than 1.750 amperes pr cob?
Click to expand...
nothing wrong with that, the cob is rated to 3600 mA

olsen said:
In most of the DIY videos I have seen before 1.4 A was recommended
Click to expand...
probably due to common driver availability. people run 1050, 1400, 1750 most often with crees

olsen said:
Higher amperage should give me more vigerous growth and better penetration right?
Click to expand...
penetration is more a function of your garden geometry than current. higher amperage will give you more light at the expense of some efficiency

olsen said:
I have also seen research reports stating that some varietes of cannabis can take as much as 1500 µmol and maybe aiming for something like a 1000-1200 µmol would be a good compromise?
Click to expand...
id say its less of a factor of variety and more of a factor of overall plant health, environment, and grower skill. You can get great results at 1500 umol but you better not make any other mistakes. perfect temp and humidity, ample CO2, big roots with plenty of feeding, etc. most people have better success at 700-1000 umol

it costs twice as much in electricity to go from 750 to 1500 umol. it will not yield twice the weight, maybe 20% more
 
You must log in or register to reply here.
Top