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Sry I assumed Cree had the same Vf for a PN, but not the case

CXB 3070's run at 38.5 Vf and 1.9A (typically) 38.5 x 1.9 = 73.15 watts, so the HLG-120H-48A can run a single CXB-3070 with almost 47w to spare. The HLG-185H-48A can power 2 CXB-3070's (parallel) at 73.15w with 39w to spare. I'd be tempted to run the CXB-3070's at 39.5Vf/ 2.175A = 86w, but the...

Most of the scientific literature on amino acid uptake by plants (so called organic nitrogen) has identified this to be important in plants in the tundra/taiga where inorganic nitrogen is limiting. I suspect that if inorganic nitrogen is provided in abundance the addition of organic nitrogen...

The Mean Well HLG-XXXH-48A power supplies will power any LED (or array of serial/parallel LEDs) which need 24 ~ 48Vf iin constant current mode; so for the HLG-120H you can dial in any LED in that voltage range up to ~110w and the HLG-185H you can power any LED in that voltage range up to ~167w...

BG Micro a Texas electronics surplus dealer is currently selling the following Mean Well LED drivers: HLG-120H-48A LED Series Power Supply, 48V/2.5A With Connectors PWR1427 $14.95 0.1245$/w...

Check it out a $45 spectrometer ! http://store.publiclab.org/products/desktop-spectrometry-kit-3-0 Analysis software is fairly sophisticated online (free) at SpectralWorkbench.org even cheaper this one fits on your cell phone camera $10...

I was using a Vero 29 Decor for the numbers, and as always "lumens are for humans" as plants (and Decor series) have a lot of wavelengths outside the lumen area. The real deal for plants is PAR, but for any given LED PAR is directly proportional to lumens, I believe. For all the modern high...

There are no real reason to under-volt COB LEDs, IME. As an example the Vero 29 run: at 38Vf makes 100Lm/w and dissipates 80w to make -> 7800Lm at 55C at 39.5Vf makes 90Lm/w and dissipates 124w to make -> 11000Lm at 55C So the efficiency (Lm/w) drops by only 10% while the Lm output is up by...

no no no all the dimming circuits in LED PSs are already PWM circuits internally, only requiring a variable resistor to set the PW (or a two other signals in the fancy PSs) The PWM unit I posted can be fed with raw DC voltage from a dumb PS and be used to give pulsed power to a DC motor or DC...

The stock Vf for CXB3590s is 36Vf, I believe, so that's not running them hard at all unless they're allowed to get over 55C. They are rated to a max of 39Vf at 4A (156w) although that would be expected to knock their lifespan down considerably.

A Mean Well HLG-185H-36* would suit this perfectly, best practice is to wire the COBs parallel with small value resistors off the negative side, but many leave the Rs off. *several flavors at Jameco, B type does dimming, A type is most flexible. If you go A all of the following could work...

Vero 18 diameter 36.2mm = 1.4252" so it should fit fine

I'm all for nice RV4 4w metal/carbon pots when they are needed, but the cermet or CP pots are good for noise free use for 100k cycles, check out the inexpensive offerings from BI Technologies / TT Electronics at Mouser. As to PWM there are some pretty attractive units coming from Asia, check...

Its a good idea, most universal input SMPS (Mean Well included) are about 5% more efficient when run at the higher voltages (with loads over 50%) and you can get a bit less heating on a given AC line going from 120-> 240->277VAC

The Optic Vero 29 is run dead stock, ie the Vero 29s are at their rated 80w, while the (cheap) Mean Well supply they use (NPF-90-42) is being run pretty hard. With a more robust supply you can easily run the Vero 29s at 130-150w each and 4 could run well over 500w. Not with the Optics case/...

Ledil has a couple, most very tight spots (10 degrees!) but one a bit wider http://www.mouser.com/ProductDetail/Ledil/CN14811_WINNIE-O/?qs=qNRlEvcb5LMWDqcuRIHuhA%3d%3d not cheap, all plastic

As much as I've enjoyed building 555 circuits, the lazy part of me thinks the Mean Well HLN-40H-36A ($29 in stock at Jameco) would do a very good job powering either 2 Vero-10s* or 1 Vero 18* for excellent CRI I'd use the *BXRC-30A1001-B-23 $4.90 **BXRC-35A4001-F-23 $14.12 both in stock at...

Please note the power supplies get their low price and efficiency by using >220VAC and may be more useful for industrial US or non US residential installation!

The new Mean Well ELG-150-C2100* looks like it might be ideal for the current crop of Vero 29s, limiting them to a safe/conservative 150w and self adjusting in the range of 36-72 Vf. Jameco lists them for $0.23/watt, although NOT is stock. The new (and currently hard to find) Mean Well...

20x CCCV Vero 29 PS (Mean Well HLG-185H-48A) at ~$0.10 per watt! Thank you Ebay!