Rooftop SE Asia

bassman999

bassman999

Well-Known Member
jrock420 said:
Do they run hot? I see people having them pretty high up in there tents.
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Most ppl run them with reflectors or lenses and that requires them to be lifted.
I dont use either, and run multiple cobs in a small space driven soft, and I can put my fingers on the cobs and not get burned.
ruby fruit said:
Sometimes i lack density cos of maybe 7-8 hrs sun vs 12-13 but quality is still there then other times i surprise myself and get really heavy buds
This is why i have another place to grow in co-op in full sun on a secluded farm
Its these that bring in the real weight
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Even if I could still grow in plain sight outside, I have trees and houses super close as yard is 12x12 ft. I dont get much sun either and it gets interrupted when sun passes trees etc...but when the summer sun hits them its intense 100*+ almost eveyday
 
bassman999

bassman999

Well-Known Member
jrock420 said:
Are they cheap to run on the electricity bill? How many would one need for a 4 sq.ft. area for adequate coverage?
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I run 12 cobs at 31 watts each over 8ft^2
Most ppl run them harder and at half the cobs.
Cobs vary in potential wattage a lot, nd they can be driven from 0 to max rated wattage if they are cooled correctly, but get more efficient the softer you run them.

Are you asking about a pre-built light or diy?
DIY is way cheaper, but you have to have basic building/wiring and maybe soldering skills.

4ft^2 I woud run 100-200 watts of cobs
 
jrock420

jrock420

Well-Known Member
bassman999 said:
I run 12 cobs at 31 watts each over 8ft^2
Most ppl run them harder and at half the cobs.
Cobs vary in potential wattage a lot, nd they can be driven from 0 to max rated wattage if they are cooled correctly, but get more efficient the softer you run them.

Are you asking about a pre-built light or diy?
DIY is way cheaper, but you have to have basic building/wiring and maybe soldering skills.

4ft^2 I woud run 100-200 watts of cobs
Click to expand...
If I did it I'd build my own. That's alot less was then I run now. I wanna see a sog done under cobs. That would drive me me towards them. I see them used alot so they must be working pretty well. What is the hue that they emit? Is it the same as a hps/mh depending on the bulb selected?
 
ttystikk

ttystikk

Well-Known Member
jrock420 said:
Are they cheap to run on the electricity bill? How many would one need for a 4 sq.ft. area for adequate coverage?
Click to expand...
A well designed setup with good COB LED fixtures should cost less than half the power as a conventional light bulb based approach once power savings of chips vs bulbs and necessary cooling are added up.

Depending on how sexy you want your setup to be in that space, you could easily run less than 200W and get very good coverage, excellent spectrum and all the intensity you need.

In fact, one of @robincnn's (Northern Grow Lights) Photon 180 fixtures would be perfect and could even handle a 3x3 space for veg or low intensity bloom.
jrock420 said:
If I did it I'd build my own. That's alot less was then I run now. I wanna see a sog done under cobs. That would drive me me towards them. I see them used alot so they must be working pretty well. What is the hue that they emit? Is it the same as a hps/mh depending on the bulb selected?
Click to expand...
3000K is about ideal for bloom, 4000K for all around use or 5000K for veg.
 
bassman999

bassman999

Well-Known Member
jrock420 said:
If I did it I'd build my own. That's alot less was then I run now. I wanna see a sog done under cobs. That would drive me me towards them. I see them used alot so they must be working pretty well. What is the hue that they emit? Is it the same as a hps/mh depending on the bulb selected?
Click to expand...
I have only done scrog in my 2x4' tent
 
jrock420

jrock420

Well-Known Member
ttystikk said:
A well designed setup with good COB LED fixtures should cost less than half the power as a conventional light bulb based approach once power savings of chips vs bulbs and necessary cooling are added up.

Depending on how sexy you want your setup to be in that space, you could easily run less than 200W and get very good coverage, excellent spectrum and all the intensity you need.

In fact, one of @robincnn's (Northern Grow Lights) Photon 180 fixtures would be perfect and could even handle a 3x3 space for veg or low intensity bloom.

3000K is about ideal for bloom, 4000K for all around use or 5000K for veg.
Click to expand...
Can they be placed on a dimmer?
 
jrock420

jrock420

Well-Known Member
bassman999 said:
It cost me a lot to make my lights, but selling my old LLumatek ballasts helped.

Most ppl buy the premade ones at 3x the price per watt and dont blink an eye, bu my budget is super small
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Oh trust me I save the money when I can. I'm the kinda guy who takes apart the washer and epoxies the motor mounts before doling out cash for a new one. Plus I like knowing how to build things so I know what's wrong when they break.
 
bassman999

bassman999

Well-Known Member
jrock420 said:
Oh trust me I save the money when I can. I'm the kinda guy who takes apart the washer and epoxies the motor mounts before doling out cash for a new one. Plus I like knowing how to build things so I know what's wrong when they break.
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Im not an electrician, but I like you fix my appliances when I can.
you should have no problem building a nice light.
Mine is rough looking, but I got 1.25 gpw with it in organic soil so like 3x better than I did with HID, but also scrogged and never did that with HID so not completely fair comparison
 
bassman999

bassman999

Well-Known Member
jrock420 said:
How much did it cost to build your setup for the 2x4 tent, if you don't mind my asking.
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Prices on cobs are much cheaper now for cobs of equivalent output and efficiency.
12 cobs $400 roughly
heatsinks $50
Wires and $30
Kapton tape $6
Thermal paste $8
Led drivers (on sale) $50 for one $65 for the other.
Dimmer rheostat (can use just one to multiple drivers/lights) 10 for $10 I tbink

$600+ and there are other parts I am forgetting likely that are cheap
 
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