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I was also thinking and wanting to do this to be sure. I have an laser temp gun and external temp probes (from a hygrometer). I'm sure there is a more accurate way; soldering a specific temp probe to the chip or something? But, not very viable at this time.

Thank you all. That was also my understanding of it.. And after thinking more on it, I do remember others running COBs and monos in series to 'fill' a driver.

BJB 47.319 holders Arctic thermal pads, .5mm, 6.0W/mK (cut to fit from a large sheet) Visual inspection indicated one cob definitely not firing fully. Only 1/3 to 1/2 of the chip was illuminating..and would flicker a bit as power was adjusted. After the circuit warmed up a bit it seemed to...

This may also a consideration; I like using CPU thermal paste, because I have much experience with it from building OC'd PCs. But, this light in question is using pads. I forget which name brand holders, the plastic ones that PLC used back in the day. I've seen dead and poorly lit diodes in...

Details: 4x Cree CXB 3070 on a HLG-185H-1400B (series) Functioning normally for years, until one day all 4 cobs in the circuit appear very dim. Adjusting the 100k pot makes no difference (as if its running in 'limp' mode and at minimum amperage?). I tested the driver w/o load: 143vDC output...

@sunny747 Efficiency, driver options, and light spread are limiting factors to a single LES design. There are some large cobs (Opto Luna's for ex, check out the thread about them here on RIU) that are designed to be driven hard. They are less efficient, but would probably handle a 4x4 tent by...

3500k works fine. Diff spectra or cri may have an effect on flowering. as is, 3500 is probably a good 'all rounder', i like my 80 cri 3000k just fine too. My own feedback on lamp design, that package is way too compact for an 8 cob array. I know everyone wants a 600/1000/de...

Yeah, tent looked small for that much light. I've grown in a 2x2 w/ four CXB3590s..I knew too much light in that space. He said hes dimmed to ~100w, and 200w was his goal at bloom.. This seems about right with a slightly larger foot print and more vertical room. I ran ~90-100w in flower with...

Lookin good. What size space/tent? What driver/drive current are you running?

Highest lumen (or PAR) per watt for that particular product. In our lighting usage, it means the most electrically efficient at converting electricity into light. This directly translates to higher efficacy overall. This is specific for that manufacture/product/light/chip/diode. Top bin is...

Since various strips are in different lengths/chip counts. Here is how you can figure out yourself what you need. For a series configuration: Take the voltage for a single strip. Ex: 20v Multiple by number of strips you want to use. Ex: 6 Equals 120vdc. Now, find a driver that has at least a...

You can series these to fit many MW drivers. Long version: Universal PSUs and buck/boost converters are a cheap/basic/simple way to 'get into it'. I built my initial cheap-CN cobs this way. I could learn the basics w/o wrecking a string of $50+ ea cobs (B3590s back a yr ago...) and/or a $70+...

FWIW, I do like the idea of a 'complete spectrum' light, especially with this board design with many chips. 2700k 90cri, 3500k 80cri, 5000k 80cri, and 660nm monos? All setup to overlap and spread with one another accross the canopy. This 'board' design makes it much more viable than a COB...

No, I sorta thought it was something similar at first.. These higher power, and much more intense. Samsung mid-power LED chips. 304pcs Samsung 561C top bin Diodes More deets here: https://www.rollitup.org/t/diy-with-quantum-boards.927159/

I have considered it, but I think w/o more vertical space, that fan cooled is important in my situation. If I was in a 5'+ space, passive for sure. I do want to convert/try some 105 or 120mm pin sinks though. So many places out of stock.. Was shopping MechaTronix sinks last night. I liked...

at ~6v they are mostly silent. at 12v you can hear them, but, nothing that would bother me. But, I live with case/cpu/video fan noise a lot. your other fans are likely louder. the 120mm exhaust fan i ran in the tent was louder. my PCs case and cpu fans are louder.

Likely not a big difference. If running parallel, and if 1 board fails, all that amperage WILL get dumped into the other board(s).. Potentially killing all your boards. You can design your circuit with a fail safe if you wish. In series, if 1 board fails, the circuit is broken, you'd lose the...

What space you running this in? How much spread from cob to cob? What size heatsinks? I had the same chips/power and in my 2x2x3' tent, I had the cobs pretty spread apart. You likely have more vertical space to allow the light to spread better, but be careful with intensity if your running...

Please, if possible, follow up with us on the results? If the client can share real world pics/info/comparisons. Converting, let alone TALKING about LEDs with some HID growers can often be a wasted effort. But, I think more are at least open-minded about it, now that COBs have proven...

Follow up, update. Some big changes happened. Cut down all the plants, tore down the grows. But, I wanted to give a follow up and info on one of my best plants/harvests to date.. Strain: Space Cheese (source: clone) Tent: 2x2x3', 4 sqft Light: 4x CXB3590 on a 185-1400b (under driven to...