Introducing CobKits.com - specializing in DIY and Citizen COBs

Diskokobaja

Diskokobaja

Well-Known Member
You dimmer them or what?? Im dzmmy for all that el. tech talk.. I order parts and my buddy set it up.. I need driver for non dimmable cobs.
 
CobKits

CobKits

Well-Known Member
DesertHydro said:
im using a hlg185 48a to run 4 cxm22 at 50w each but it will go up to ~62.5w each if i crank it up all the way. im using constant amperage. not sure about the constant current drivers.
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measured on AC or DC side? that sounds high on the DC side as the driver maxed is ~55-57W per cob (1060 mA@53-53.5V). but yes at 92-94% eff it will pull 240-245W at wall
 
visajoe1

visajoe1

Well-Known Member
cobs, im testing my electrical learning here. if i used my 12v 10a dc converter
upload_2017-3-25_17-20-12.png
hooked up to this 900w cv/cc adjustable boost converter
upload_2017-3-25_17-20-57.png
would i have an adjustable driver for 36-72v chips and up to 900 watts of power?
 
1

1212ham

Well-Known Member
Hard to say what the efficiency will be. I seemed to get power surges with the 600 watt version of that variable supply. The constant current is not working on my supply and I think a surge may have damaged it. I'll probably buy another to play with, maybe the version with trim pots rather than the digital control. BTW, I was just running 36v COBs with three 12volt computer supplies connected in series.
 
visajoe1

visajoe1

Well-Known Member
1212ham said:
Hard to say what the efficiency will be. I seemed to get power surges with the 600 watt version of that variable supply. The constant current is not working on my supply and I think a surge may have damaged it. I'll probably buy another to play with, maybe the version with trim pots rather than the digital control. BTW, I was just running 36v COBs with three 12volt computer supplies connected in series.
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efficiency of the booster? here is specs

Technical parameters:
Input voltage: 8-60V
Input current: 0-15A
Output voltage: 10-120V
Output current: 0-15A
Output power: 900W(MAX)
Conversion efficiency: 85%
Working frequency: 150KHz
Short circuit protection: 20A fuse
Operating temperature: -40℃-+85℃
Control method: Numerical control+Digital tube monitor
Voltage adjustment: <100V/0.01V
Display resolution: >100V/0.1V
Minimum resolution of power display: 0.001W
Current adjustment: <10A/0.001A
Display resolution: >10AS/0.01A
Minimum resolution of capacity: 0.001AH
Output ripple: ≤50mV
Dimension: 110(L)*99(W)*46(H)mm

- Memory function, 10 sets of parameters can be saved.
- With OUT(output),CV(constant voltage),CC(constant current) indicators.
- Can manually set whether the booster output automatically when power on or not.
 
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1212ham

Well-Known Member
CobKits said:
ive had mixed results with those. i think dedicated led psus are worth it in every regard
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Quality LED drivers may cost more initially, but they are more efficient and very reliable. I think of it as an investment, they will probably run for decades.
With 12v power supply feeding a boost converter the efficiency losses add up. I do like the cheap constant current/constant voltage converters for experimenting and testing.

Visajoe, when I connect power to my digital booster the LED flashes from a power surge, even with low power settings or the output turned off. I also have the smaller 250 watt booster you pictured, no surges with that one. This is all getting off topic, maybe I'll start a thread on alternative and experimental drivers.
 
visajoe1

visajoe1

Well-Known Member
1212ham said:
Quality LED drivers may cost more initially, but they are more efficient and very reliable. I think of it as an investment, they will probably run for decades.
With 12v power supply feeding a boost converter the efficiency losses add up. I do like the cheap constant current/constant voltage converters for experimenting and testing.

Visajoe, when I connect power to my digital booster the LED flashes from a power surge, even with low power settings or the output turned off. I also have the smaller 250 watt booster you pictured, no surges with that one. This is all getting off topic, maybe I'll start a thread on alternative and experimental drivers.
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ya, i dont wanna hog cobs thread, lets fire up a thread for powering cobs with alternative supplies with pros/cons do's and donts. your feedback on digital booster is awesome. for testing or short term use, something like these could work for some folks?
 
CobKits

CobKits

Well-Known Member
just to expand a little bit, i had a few of those around in an industrial environment for 24V alarm/signaling, so i thought they were cool. so i bought a 400W one to try to run a 3618 light engine out and it wouldnt light it. more like flash>click>flash>click>repeat. it couldnt provide stable voltage even though it was in spec.

i actually have the real deal hlg480-3500 coming this week so we'll see whats up with 400W cobs
 
visajoe1

visajoe1

Well-Known Member
CobKits said:
just to expand a little bit, i had a few of those around in an industrial environment for 24V alarm/signaling, so i thought they were cool. so i bought a 400W one to try to run a 3618 light engine out and it wouldnt light it. more like flash>click>flash>click>repeat. it couldnt provide stable voltage even though it was in spec.

i actually have the real deal hlg480-3500 coming this week so we'll see whats up with 400W cobs
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400w to a single cob?? i def wanna see that
 
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