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>> so 1000 watts of cob power in 5 x 5 area should do well ?? >> You bet!! Ok, 20x CXB3590s 36V@1400mA (50W each) in 5x5' is 973 PPFD Very nice! I first thought 20 COBs would be crazy, but it's just the right/optimal amount of light. (Common understanding is that +/- 1000 PPFD is optimal...

Yeah that's Jerry. Just be aware there will be $40 s/h but it will be SUPER FAST. He doesn't ship by slowass "China Mail" anymore. (I had some replacement leds sent from..cough, cough, Marshydro...took 7 weeks via "China Mail". Jerry sends TNT or some other service, will likely come in 2-3 days...

Yeah, those 80 deg lenses. I don't really see any problem with my plants since I have those CXBs running, in-fact my plants are growing like MoFos now! Except one plant/strain might look like as if there MIGHT be some discoloration *possibly* from the light, but that could be the strain or it...

Can anyone tell me what is the safest distance to CXB3590 @1600mA, 3500K with LENSES...without risking light burn?

I've seen lights where I had the impression that people overrate cooling in general. TBH, while "in theory" of course there are advantages (efficiency, output, life span of LED etc.), does it really matter in practice? In my opinion, there is no need for a HUGE ASS 2kg etc. heatsink for a single...

Hey! I was growing (vegging mostly) with two 300W (60x5W) Marshydros but I got VERY into LEDs and the tech behind it. THIS forum here is great, the knowledge and work by people like Realstyles or Supra and many others is so helpful! So a few weeks back I decided I wanted a new light so I did...

Why are folks always recommending the B version drivers? I got a A version 240W 1750mA with the internal pot and I think it's totally fine. Why do you go through the hassles with connecting pots etc. if there's already one there? For the wider dimming range? (The one I have with the internal pot...

I didn't exactly get why he put an aluminum sheet there? Can't you just tape the chips on the bare heatsink? (After removing the panel with the LEDs) Edit: NVM, I see why I need the plate.... the HS is a lot smaller.

Yep that's what I wanted to know/thought. So in other words it's already attached (or there is a way to attach it directly). Just didn't remember from opening my lights :) Edit: That light hack seems not only be very easy to do, it amazes me because it might be ALMOST on par to the light I just...

Just double checking, A) CXB3590 and fan, IN SERIES B) CXB3590 and (2x CX1512, parallel), IN SERIES (Stupid question but the fan will hardly be parallel to the driver which outputs 100V, but just double checking can't hurt :) ) Edit: Is it that the fan isn't already connected to one driver...

Glas is cool, I actually got lenses for my COBs. I can live with 5%-10% loss but I am growing semi-outside (balcony), LOTS of dust so I want those a little protected. Edit: Dust, bugs etc...

Awesome pics! I am aware the heatsink is "meh" to say it mildly, but then it has a 120mm fan, I GUESS the meh original heatsink *should* be "ok" to dissipate 100-120W, like the original draw of the Marshydros. The point of my experiment would be to reuse as much as possible, buying a rather...

The Kapton tape really strong enough and it holds the COBs like this? Did you just remove the panel with the LEDs and tape the chips on the heatsink? Or did you use some aluminum plate on top of the HS like I saw in some video? If you have a link with the exact steps you did to convert your...

You are right! Seems this where I looked at is for the 36V version. Sheesh this is what you get if people post specs and leave out important details. Edit: Oh wow, I see you did EXACTLY that I want to do with my Marshydros. Brilliant!

CXB3590 72V@0.7A would "only" be 5000lms (for the 3500k) and the CX512, say 1000lms, which would make a total of 12,000lms for one fixture. Ok let me look at three Vero 18, estimating 2700lms each at 0.7A, would be 16,200. Ok, so Vero looking "better", now just looking at lumes. >> 3 Vero 18s...

The eternal debate :) I just switched from 2x 300W Marshydro lights to custom-made CREE COB lights. Want to know my REAL, first-hand opinion after growing about 7 months with the 300W lights? (Mind you, I did not flower with those lights, only veg). Those are BEGINNER lights and they are "ok"...

Driver specs: model: PT1004F-60W (60W) in: 100-240V out: 55-100V (0.69-0.72A) Can I run three CREE CXA2540 on one driver? I am still not understanding how this works. So 3x36V COBs like the CXA2540 (I mention the CXA2540 because I can get those VERY cheap) = 108V - but 108V@0.7A = 75.6W. So...

Forum seems to keep cookies (means, logins) separate whether you are on http://rollitup.org or https://www.rollitup.org I go on rollitup.org, I am not logged in. Then I switch to www.rollitup.org, I am logged in Nothing major, but as a webmaster/SEO myself, one of the FIRST things I learned...

When I get my new COB lights on Wednesday I will have two 300W Marshydros over. My plan is to convert them to additional COB lights, with 4x CREE CXB2530/2540, using the Marshydro Case and drivers. (The drivers of the MH by the way are 2x60W, out:55-100V@0.69-0.72A) (The plan is to make...

Well I can see it being better than using glue or tape, not saying it would be optimal of course :)