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What's your source of triacontanol? I was thinking of making some alfalfa tea to add to my hydro rez but there is no agreed upon ratio of alfalfa to water it's also available in pure form but you have to dissolve it in polysorbate-20, not sure about that rout

Do we know what's in Roots Excelurator? I have used it in the past and must say that it does work very well, but is absurdly expensive Also it doesn't have a very long shelf life One bottle that I had sitting around for over a year caused root infections that killed a few of my plants would...

I believe Cutter would still be the better deal for a 48 COB setup no? Timber 8x (6 COB 300w) kits @ $629ea + shipping $0.00 = $5,032 Cutter 1x (MAU5-48 COB) kit @ $3599 (US Dollars) + shipping $600 + handling $200 = $4,399 Cutter seems to be still about $600 cheaper even with shipping and...

Literally exactly what I was planning. I'm definitely going to include the 730nm far red, then determine the mono mix and when I add them based on what my budget is going to be. I am building a canopy 10 (really a canopy 12) and was planning on 50w worth of royal blue and 50w of photo red. I...

Mark you are the best!!! I wish I could buy you a beer, or fax you one! I'm sorry if I'm nitpicking, but when making a potentially substantial investment, I like to make sure I have my information straight so as to make a theoretically informed decision. If it helps to know, I will be ordering...

God Damnit Cree!!!! Get you're shit together...you're supposed to be the best! Okay how about this graph...even though its a spectral graph of the Citizen CLU048 COBs spectra (all 90CRI), could it apply to the Cree CXB COBs as well? Or is that wrong to assume that? I assume that a 90CRI 3500K...

Wow! That actually changes a lot if that's the case. I didn't order anything yet thankfully. So here are two spectral graphs, the first is the one I posted from Cree with the various spectra of CXB3590's overlayed with PAR numbers, the second is an independent graph from another thread courtesy...

Wow exactly, a 3500 base with more 660nm, perfect! I would definitely be very interested, is that available? Do spectral graphs of the 80 CRI and 90 CRI 3500K exist? They're not on Cree's datasheet Makes it tougher to evaluate without the spectra, like flying blind-ish (we do have a ballpark...

Yep, same one. Senescence may have diminished its vigor a bit, but I'm still hunting for that holy grail aroma I got the first time round! If I had to guess, I'd say its between 3-4 years old at this point. I'm not exactly sure how long the guy who gave it to me had it before I got it. Could add...

Yeah funnily enough, the 90cri 3000k has more blue AND more red than the 80cri (or at least more red in the 630-700 range). I was looking up CRI and I can't find reference illuminant spectra for anything but daylight. "For CCTs less than 5000 K, the reference illuminants used in the CRI...

Growmau5, firstly, thank you for all of your research, experimentation, time, effort, and dedication to your craft; and most of all, documenting it all and giving all of us entree to the world of LEDs and electronics with your brilliant ground-up instruction! You've made a lot of things possible...

This is why Cutter is so awesome!! Neat video too Mark, it's like an episode of "How It's Made" but with a way funkier soundtrack! I always enjoy seeing behind-the-scenes footage like that. I have some 22awg solid core 300v wire for the mono stars, I'm assuming this is acceptable? Can't wait...

I LOVE YOU!!! Oh one more quick question, I was wondering of it possible to get this star (link below) in a solderless? I don't know how the solderless option works i.e. if that's something you do at Cutter or if you have to order them from the manufacturer like that, and if there is a minim...

Looks like a neat light Airwalker! I'll definitely take a closer look. I think my preference is for discrete diodes so I can smear the light over a larger area and not worry about point sources. I made a schematic for a new DIY project with COBs as well as lots of single diodes, kind of similar...

Hi Mark, so as far as the MAU5 kits go, the awesome new black anodized HS14080P heatsinks aren't included yet is that right? I'm assuming they haven't come in yet Also might you have an estimate as to when these 660nm Cree XPE diodes will be back in stock...

Which cycle timer are you using for the 15 min on 45min off cycle? I have {this one} but it's in use for a rez. It used to be $12 on amazon. I guess Titan bought them or something and now they're over $40...Cycle timers are such a rip off!

I was trying to decide on a good mix myself. I'm doing a 16 COB light @ 1050ma so here's the mix I arrived at based loosely off of growmau5 canopy 2: 4x 3000K (25%) 8x 3500K (50%) 2x 5000K (12.5%) 2x 6500K (12.5%) 15x mono 660nm 15x mono 430nm 7x mono 730nm (far red after lights out 15min)...

Now that's some good data! Awesome @coreywebster, much Appreciated!! Also thanks @bggrass for making the calculator! I'll have to make a dropbox account so I can download it

Does anyone know the Forward Voltages of Cree 36V CXB3590s @1050ma? The Cree datasheet only lists it down to 1400ma (~34.8V) :http://www.cree.com/~/media/Files/Cree/LED-Components-and-Modules/XLamp/Data-and-Binning/ds-CXB3590.pdf (page 9) I'd like to be able to calculate how many COBs I can...

I was thinking of driving the red XPEs 660nm @ 1000ma (3.5w?) and the far red 730nm XPEs @ 400ma (1w?) does this sound okay?