Grow Northern / Dutch Passion will be back...
pics and all in two weeks as ever...!o! .. iynwim
- Philips Rebel chips as standard
- 75W - virtually silent
- 220-240v only.
- £330 in VAT.
Killer priceRamp-3x70W-210w led hydroponics
COB LED 200 W ramp online 3x70 W, CREE LED CXA 3070 under lens
27,400 lumen temperature - white choice:
2700 ° K - 3000 ° K - 3500 ° K - 4000 ° K - 5000 ° K - 5700 ° K - 6500 ° K
Use: Grow plant, professional lighting.
MEAN WELL Power 200 W - 240 volts integrated in the aluminum-section comes with 3 m cable
2 cooling fans 19m3 / h, 27dB
VMC connection option on 80 mm diameter with removal of fans.
3x90 ° lighting angle spacing diodes: 56 cm
Aluminium dimension 1443 * 110 * 65mm weight 6300 g
Brushed aluminum finish; thermo lacquered paint on option
View attachment 3286957
in french...
http://www.eclairage-led-relamping.fr/led-cob-croissance-plante/140-rampe-led-210w-3x70w-hydroponique.html
Is anyone concerned about the fact that these Philips Rebel boards are not well designed:Grow Northern / Dutch Passion will be back...
pics and all in two weeks as ever...!o! .. iynwim
- Philips Rebel chips as standard
- 75W - virtually silent
- 220-240v only.
- £330 in VAT.
I get an invalid page on that link iukwim^^^^^^^^^^^^^^
Maybe this will help
Is anyone concerned about the fact that these Philips Rebel boards are not well designed:
http://grownorthern.co.uk/index.php/online-store/category-3
Putting all of these LEDs of various forward voltages in series will not result in equal or even optimal current control. The board doesn't have any components which would regulate the current across the different LEDs (such as a few transistors for a current mirror). The Philips Rebel packages have forward voltages that range from 2.3V-3.1V at operating temperature, and the Everlight LEDs have a Vf of only 2V.
This practice seems to be the case with most of the low quality multi-band LED lights on the market. Is anyone aware of this or even care?
In here...guod chimes in on page 2I get an invalid page on that link iukwim
Never realized you had them all on the same driver(s).That's the second post I've seen saying different forward voltages can't be used on the same driver.
I remember hearing that a lot in the past. I asked questions...no one would answer. So I tested it out myself. And guess what....
I call bullshit.
Never realized you had them all on the same driver(s).
Are they all series? or did you have to parallel the monos somehow?
@FranJan threw me off today when he said he didn't know that either and he has already built a few lights, these are the basic or electricity. Individual stars or chips inside of a COB are going to use different voltages, even if its just a little. Not all CXA3070 draw the same voltage neither.That's the second post I've seen saying different forward voltages can't be used on the same driver.
I remember hearing that a lot in the past. I asked questions...no one would answer. So I tested it out myself. And guess what....
View attachment 3287214
I call bullshit.
No, no what I didn't understand was the behavior of drivers, that you can fudge the circuit to make sure a driver will work in certain circumstances. Different forward voltages I knew were OK from repairing my Blackstars which have blue red white UV and FR of different Vfs all in one string. I even just said something to that effect just a week or so ago to another poster who said you can't run LEDs with different voltages in the same string. Church just threw me in another thread and made me realize that I wasn't looking at the circuit the proper way. Sometimes my laziness gets the best of me and I stop thinking things through when I get the answer I want . Yup Ima human .@FranJan threw me off today when he said he didn't know that either and he has already built a few lights, these are the basic or electricity. Individual stars or chips inside of a COB are going to use different voltages, even if its just a little. Not all CXA3070 draw the same voltage neither.
I agree - I was under the impression that the variation in forward voltage drop at different temperatures between InGaN and AlInGaP LEDs was significantly different. Checking some datasheets I can see that this was a long held misconception on my part. Perhaps I read too many reference designs from LED driver IC manufacturers...The "you can't run different LEDs with different forward voltages on the same series circuit" debunked.
I agree - I was under the impression that the variation in forward voltage drop at different temperatures between InGaN and AlInGaP LEDs was significantly different. Checking some datasheets I can see that this was a long held misconception on my part. Perhaps I read too many reference designs from LED driver IC manufacturers...
I'm prepared to get roasted for this haha, due to laziness and the fact that it is in fact sleezbay but are these worth it all for a non diy guy like myself??
http://www.ebay.com/itm/3pcs-21W-CREE-COB-Warm-White-LED-Ceiling-Down-Light-Golden-Shell-Belt-Drive-110v-/371183408806?pt=US_Light_Bulbs&hash=item566c4156a6
Yea that name going across the pic def made me think china, which doesn't ALWAYS scare me but anywho, out of almost 300,000 sales i tried to see the upside lol. Plus i realized i would need like 25 of them to accomplish my goal sooo yea theres that...its based in china though. So warranty ...... . It may not really be cree. The seller has 1668 negatives.