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I got a lot of responses on another forum and it seems the issue has been hammered out. I'll share the solution in-case someone with similar struggles has issues. So first off, my meter only measures A/C Current. Apparently I could place a 0.1ohm 1w resistor in series with the COB, then measure...

So I finally ordered a couple COBs and wired one of them up. Honestly, I was a little shocked it actually lit up lol. Even the dimming works great. So about the multi-meter...I'm thinking I just didn't order a high enough quality one. I got this...

Is this what you're referring to? https://www.apogeeinstruments.com/sq-500-full-spectrum-quantum-sensor/ In the future I'd like to design a LED fixture with a spectrum ideal for veg and compare it to MH, T5, etc. for the veg cycle. To do that I may need a spectrometer which is way down the...

Dude you need to chill the fuck out. You're acting like you're in a position where you can end this entire discussion with one post. Your're not, sorry. I'm talking flux as in light output of the COB, which can be used to determine the efficiency of that COB @ the drive current you're testing...

No, I don't see how you could surmise from my post that lux is irrelevant. PAR is directly connected to the flux output of the COB, which is why its showcased in their datasheets. Just because plants don't utilize the total flux output of a COB LED diode, doesn't render a lux meter useless. I'm...

I said I'd be purchasing a quantum sensor and am questioning purchasing a lux meter in addition to that for the sole purpose of filling the input this calculator requires. Maybe the nominal flux is used to determine the value of one of the other variables this calculator has in addition to PAR...

Sweet, thanks @sixstring So it appears the harder you drive the COB, the higher its Forward Voltage. 1.75a isn't listed in that data, so I'll be able to fill in that gap with this test. I think a 12 COB fixture pushing the Vero 29 @ 1.75a would prove to be fantastic. Time will tell... @gwheels...

Well the next thing I'm doing is building out a 12 COB fixture and purchasing the components for a "High-End HPS" fixture then running them in separate tents over what I suppose will be a yet to be determined strain of hemp. I need the lux meter to test the COBs individually for my 12 COB...

Alright, I see what you're saying, thanks. So a PAR meter will be added to the list of things to order today. To be ordered today: -(1x) CXB3590 (CD) 80 CRI 3500K -(1x) Vero 29 Gen 7 80 CRi 3500K -(1x) CXM-22 Gen 3 80 CRI 3500K -(3x) FN14074 Reflectors -(3x) SSTX Splayed Fin Heatsinks -(1x) 1.7...

Why do you say that? I'm not opposed to buying a PAR meter in addition to the Lux meter. Its just I've just seen people online do the conversion and I have a calculator which uses various inputs (one being nominal flux) to determine the PAR without having a PAR meter. I figured I could save a...

I have noticed the COB datasheets display a range for the forward voltage of their COB, but the wholesalers of these COBs only advertise a fixed voltage. How do I determine where in the range I fall @ the current I'm aiming to drive? I will probably use hemp, thanks for the suggestion. You can...

I'm purchasing a lux meter to observe the CXB3590 (CD) 3500K & Vero SE 29 Gen 7 (D) 3500K @ 1.75 amps. The results of this observation will be used for a 12 COB fixture design. I'll likely test more COBs, and these same COBs, at different currents after these two have been tested @ 1.75a. Any...

Windows 7 desktop. The Forums button has a drop down icon next to it but clicking the Forums button itself has the same action as clicking the drop down button. Also, I would consider making the dark theme the default. It really is much easier on the eyes and makes the site easier to navigate...

One thing I've noticed is I think the "Forums" button should be a separate button from the drop down menu button. Its a bit annoying to get back to the forums at the moment.

All I'm really saying is we're speculating whether the numbers we see are true representations of the product. Until someone buys those expensive meters, and does these tests, we aren't going to really know the truth for sure. I'm working on getting into a position where I can do this.

Then neither one of our sources are credible enough. Its not a fact that the numbers for a product advertised by that product's manufacturer perfectly reflect measuring the physical product's performance yourself. They both have reasons for us to believe they are partially credible and reasons...

That's uplifting to hear, for sure. I mean no, we're not at Harvard. Maybe somewhere in-between Weedology and Harvard, lOl. I get that for real I do. Y'all will probably see something from me end-October early-November. I am calm lol I'm a tame dude these days I don't think the rest of the town...

Hey it's up to you man...I'd convert it to a 12 COB fixture running just 75 watts over what you're doing right now and reap the benefits from a 16% efficiency increase with minimal increase in power draw. If we were talking a 5-6% efficiency increase at the same current or something I could see...

Plenty of threads all over this forum using this technology with fantastic results. A brand new grow was just posted by a guy, realstyles, who really seems to know his stuff. The results of growing cannabis with LED are documented on this forum and that documentation is becoming more and more...

@PharmHand The figures I use for HPS bulb degradation are from a member of the farm actually measuring the light output over the course of 3 months and reporting the results. I'm not surprised the manufacturers of these bulbs advertise better than what their product produces, but when you record...