Search results

Paypal charges extra for international payments. True, it is probably already rolled into the price in most cases and it is nice to have the option to save the 4.5% by using alternative payment methods.

Hard to say because it very much depends on the circulation airflow in the tent. One thing is for sure, without a fan it would get very very hot. The 80mm fan only consumes about 2W so I believe it is well worth active cooling in most cases.

The CXB3590 4000K CD that Jerry has is 80 CRi. I tested that in flowering and it seemed to do just a good as the 3000 and 3500. But the CXB3590 4000K DB that cutter has is 70 CRi, so I assume that means less red, more blue/yellow/green. Hard to say whether the bin increase offsets the spectrum...

And a bit of flux maybe?

You probably want it turned all the way up (to the right). Are you driving a pair of CXB3590s 72V or just one? If it is a pair, the driver will reduce current from it maximum (1525mA) down to maybe 1050mA because the voltage of the COBs would be too high. So the driver automatically reduces the...

Yep, 200W as described above should more than replace a 400 HPS.

Passive cooling is more realistic for very low current COBS ~ 25W ea but at 50W ea I think active makes a lot of sense. A good starting point for flowering lamp: (4) CXB3590 350K CD 36V (1) HLG-185H-C1400 (1) 3.5"X40" Heatsink with 80mm fan blowing into the center There are many heatsink...

CXA3590 and CXB3590 are available in either 36V or 72V class and he is referring to 36V class. You can tell whether it is 36 or 72 from the part number (R designates 72V and N designates 36V) Because of driver design, 72V is good if you plan on running at medium to high current, 36V is good if...

Good info thnx, are there any holes behind the COB?

In a nutshell, COBs are very large LED arrays for a much cheaper cost/PAR W than single diodes. Because they are cheaper we can afford to run them at lower power. When you run LEDs at low power the efficiency increases significantly (current droop). So the idea is run them very efficiently to...

email Jerry @ jl@kingbrite.cn or Mark @ Cutter Electronics, he recently got a batch of top bin 3070s and 3590s, ships from AUS for about $10 if I recall and offers discount code 'CUTANDROLL' Pacific Light Concepts has 3070 BBs for $36 and ships from US for about $5 These are good days for COBlins

Wow nice! Is the copper pad solid underneath and is the copper part flush with the aluminum part?

They will blend, but not evenly, so my plan is to use COBs that we know can stand on their own for flowering (2700K 3000K 3500K 4000K) and then hopefully benefit from whatever blending does occur

To go a step further to try and analyze the difference in efficiency between the 3070 and 3590 top bins, since they were mounted on the exact same heatsink I adjusted the power to exactly 25W and exactly 50W and allowed the heatsink temp to stabilize. Then I used a digital probe to try and get...

OK I have the CXB3070 3500K BB from PLC and a CXB3590 3500K CD from Kingbrite. I decided to scrap my original data and start over with a better methodology. This time each COB was mounted on the exact same heatsink and the heatsink was hung using chain with the holes marked so it hangs exactly...