Led kits pricing

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Photwenny

Member
Im looking to get an led light kit. Ive checked a few places and its a bit confusing, which site the best deals? Im looking to replace my 1000 hps and seems like the cree 3590 and citizen cobs are popular with most people using 12 cobs per 4x4 to 5x5? Also, would it be worth it to just buy the kit with light frame instead of going out and buying parts to make one? Help me out my girls are sweating here :fire:
 
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Photwenny

Member
Whats your thoughts on the horticulture light group citizen cobs? The price is good and they use 16 cobs for the 1k replacement. I looked at cobkits and timber, im not sure exactly whats needed and how much it will be total. But if i can build a nice looking one for lower than 1300 hort light group charges i might go that route
 
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doz

Well-Known Member
RapidLED has some good prices on "kits", better than the "big names" around here.
 
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Photwenny

Member
Are 9 cobs going to be enough? Also how hot does it get if using 9? Would using more cobs in the same area be overkill? I want to build a good light the first time around and not be disappointed later on. Do you think the cree cobs are going to provide more intensity or will provide more benefit over the citizens? Also, will i need the thermal padding and glue? Sorry for so many questions.
 
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CobKits

CobKits

Well-Known Member
thats what im using in half of a 5x9 and im happy with the results. it would be considered a lot of light for a 4x4 (16 SF), intermediate amount of light for a 4x5, next step up (in my mind, i think in squares) would be 16 cobs@50W each which imo would be too much in anything less than a 5x5. you could do 12 cobs i suppose

if you went the 16 cob route you could go with citizen 1212s on 120mm heatsinks @ 50W each and youd be maybe $650-$700 for 800W
 
CobKits

CobKits

Well-Known Member
you need 600-800W to replace a 1000 hps. the rig that can do it with 600W probably costs close to twice as much as the one that can do it for 800W

in either case 600W is 600W of heat (and 800W is 800W). if heat is your major concern you want to be on the more efficient side which means running a greate rnumber of cobs at 30-50W each as opposed to fewer cobs at 75-150W each. apart from straight efficiency, using a higher number of cobs generally mean better coverage and less hotspots which can bump yield as well.

a rule of thumb is if you cut the wattage in half, efficiency goes up about 10%

so 4 cobs@ 200W each = 800W

if you do 8 cobs@ 100W each youd be 10% more efficient so you really only need 8 cobs@ 90W= 720W to produce the same amount of light

or 16 cobs @ 40W = 640W

or 32 cobs @ 18W each = 576W

all will produce the same amount of light
the lower wattage builds with more cobs will put less heat in your room (but youre buying a lot more gear to start)

50-75W each on cobs is popular

if youre gonna obsess over efficiency and use a bunch of chips at lower wattage extruded bar heatsinks start to make sense over the discrete pin fins
 
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Photwenny

Member
I like the idea of having 9 cobs instead of 16. Is it possible to pull 2 lbs from that light with the right setup and strain? I might go with the cree if they are going to produce more. My space can be 4x4 or 5x5, just depends how i fill up the canopy. If i go the 9 cob route, is the heat going to be near a 600 watt hps? I am getting ready to place the order and see what leds can do.
 
CobKits

CobKits

Well-Known Member
Photwenny said:
I like the idea of having 9 cobs instead of 16. Is it possible to pull 2 lbs from that light with the right setup and strain?
Click to expand...
easily

Photwenny said:
I might go with the cree if they are going to produce more.
Click to expand...
they wont they only cost more

Photwenny said:
If i go the 9 cob route, is the heat going to be near a 600 watt hps?
Click to expand...
pretty much in that ballpark. advantage being that plants actually like it at 85 degrees under LEDs so heat is less of a problem
 
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