CXA/CXB 3070 build

I would run the two higher kelvin crees on a dimmable and the other three 3000k on another. This would give you control of the spectrum. You could even run the 6500k and the 5000k on their own drivers but I still recommend dimmable versions. I use the hln-80h-42b on each of mine but it is a little overkill and they are always dimmed.

grouch said:

I would run the two higher kelvin crees on a dimmable and the other three 3000k on another. This would give you control of the spectrum. You could even run the 6500k and the 5000k on their own drivers but I still recommend dimmable versions. I use the hln-80h-42b on each of mine but it is a little overkill and they are always dimmed.

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Hl"N"? I didn't know they had those. Cool. So you're running each cob on one? Cause damn dude, 4200mas is enough to blow the shit out of a CXB. I'd be nervous that'd it get dimmed up on accident.you're always at like half power? Why not get the "A" version and just internally dim for 2100?

Airwalker16 said:

Hl"N"? I didn't know they had those. Cool. So you're running each cob on one? Cause damn dude, 4200mas is enough to blow the shit out of a CXB. I'd be nervous that'd it get dimmed up on accident.you're always at like half power? Why not get the "A" version and just internally dim for 2100?

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It's the 80w series, the 42b is capable of 1950ma. There is also a 60w series but I am unsure which models are available. The a series only allows 50% dimming and I wanted more flexibility. It's real easy to put a potentiometer on them.

How's this coming along? You have your pieces and parts yet?

splift124 said:

I understand your point and it would be nice to save a little bit but my idea is to run certain COBs at different mA. I will also be installing switchs to easily flip on the COBs for different stages of growth so I figured it be easier to wire it that way.

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there are some drivers that only cost $5-10 that are up to 50W. cheap on ebay.
300mA, $3 (drives 1 CXA3590)
300mA, $7 (drives a pair at 280mA)
300mA, $8 (plastic shell, should drive a pair @ 280mA)

Unfortunately I have to put this build on hold and settle for a CFL setup instead(My partner backed out so I have less funds). I will be able to purchase all the bulbs next friday and should be up and running by the end of the weekend. I'm going to post in the CFL section when ready.

splift124 said:

Unfortunately I have to put this build on hold and settle for a CFL setup instead(My partner backed out so I have less funds). I will be able to purchase all the bulbs next friday and should be up and running by the end of the weekend. I'm going to post in the CFL section when ready.

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Hold up a sec If you don't already have cooling fans for your cabinet i may have stumbled on a way to combine the cabinet cooling, lighting efficiency, and plant health. Here's the idea, thermostat controlled fans on the led heatsinks that are oversized so they will only run for a few seconds then kick off. The lights are interspersed in the cabinet so each time a fan kicks on its like the wind is blowing from a different direction (the plant health part). The effecincy comes from running the led at the optimum temp (CREE CXA3070 has fall off in output according to spec sheet above OR below 85 C?).

Running test now CREE CXA3070 @1.5amps with mw OWA-60U-42. Got led case temp of 178F after 30 minutes of operation at ambient temp of 53F, ran fan for about 30 sec, case temp dropped to 147F. 20 minutes later case temp back up to 178F.

ANSI or any other sanctioning bodies test criteria were not followed here. Just a redneck with a cause!!!

Please post any commentary any similar experiments or ideas like dimming with temperature????