Vero 29 build assurance

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Stoner_steve91

New Member
im new to the forum and really just looking for someone more knowledgeable than I to assure me all my math is correct. I’m looking to start my first grow within the next few months. I’m planning a 2x2 tent using soil. For the lights my plan is to start with two Vero 29’s 3500k 80 cri “c” version in series ran by a hlg 185h-c1400. By my calculations that should give me about 95 Watts per cob or 190 watts total which gives me just shy of 900 ppfd. After I’ve saved some money I’d then like to add two more identical veros. My thought is that I could still use the one driver and wire them in a combination of parrellel and series to cut the milliamperes down to 700 and bring my efficiency up. Can someone please verify for me that I have properly done the math and also that I can mix wiring schemes like that without having to worry about thermal runaway or something crazy. Also I don’t know what to use for Heatsinks. Rapid leds pin heatsinks are only rated to 70-80 Watts. I’ve seen the sst x heatsinks that hlg supplies but they are not in stock. Do you know of any other passive heatsinks that can handle 100 Watts or am I stuck using active heatsinks like an arctic? Any help is much appreciated! Thank you!
 
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Stoner_steve91

New Member
I forgot to mention the “c” version at 1400 mA should be about 68.3 volts and that driver can supply 71-143 volts. So I should be almost maxing out the driver.
 
HydoDan

HydoDan

Well-Known Member
Your setup with two cobs is going to be plenty of light for 4 square feet.. That's 47.5 watts a square foot... For more light..You need a bigger area! Lol
 
nc208

nc208

Well-Known Member
Stoner_steve91 said:
im new to the forum and really just looking for someone more knowledgeable than I to assure me all my math is correct. I’m looking to start my first grow within the next few months. I’m planning a 2x2 tent using soil. For the lights my plan is to start with two Vero 29’s 3500k 80 cri “c” version in series ran by a hlg 185h-c1400. By my calculations that should give me about 95 Watts per cob or 190 watts total which gives me just shy of 900 ppfd. After I’ve saved some money I’d then like to add two more identical veros. My thought is that I could still use the one driver and wire them in a combination of parrellel and series to cut the milliamperes down to 700 and bring my efficiency up. Can someone please verify for me that I have properly done the math and also that I can mix wiring schemes like that without having to worry about thermal runaway or something crazy. Also I don’t know what to use for Heatsinks. Rapid leds pin heatsinks are only rated to 70-80 Watts. I’ve seen the sst x heatsinks that hlg supplies but they are not in stock. Do you know of any other passive heatsinks that can handle 100 Watts or am I stuck using active heatsinks like an arctic? Any help is much appreciated! Thank you!
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Imo. I'm using this exact driver and cobs. I use a 135mm heatsink and no way would I think it could handle 100w. At 70w it gets very hot. I would definitely add fans if running them that hard.
 
ANC

ANC

Well-Known Member
HydoDan said:
Your setup with two cobs is going to be plenty of light for 4 square feet.. That's 47.5 watts a square foot... For more light..You need a bigger area! Lol
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Plenty of light but good spread if just turns down the current to enough.
 
ANC

ANC

Well-Known Member
This is the kind of shit I'd get off Alibaba (as opposed to actual LEDs).
They come predrilled, just add vero29 to search term

If it is about saving money, I'd price out the same system using the Bridgelux strips. (include heatsinks and fans and all extras need to build each), the Bridgies are just a little less good than the Samsung strips at quite a bit less money.
 
Rocket Soul

Rocket Soul

Well-Known Member
If youre planning on running another string on paralell its important that your thermal management and heatsinks are the same; if you use different heatsinks your chips will run at a different temprature and voltage wich means they will draw current unevenly hich may cause thermal runnaway.
 
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Stoner_steve91

New Member
Rocket Soul said:
If youre planning on running another string on paralell its important that your thermal management and heatsinks are the same; if you use different heatsinks your chips will run at a different temprature and voltage wich means they will draw current unevenly hich may cause thermal runnaway.
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Ok I assumed that would prolly be a no no.
 
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