CobKits
Well-Known Member
boy thats tight id have to test it. it wants 156V and has 152Could I do 6 of the clu058's and run them at 2.1, would 2 of the 320 2.1 amp drivers run 3 each then?
boy thats tight id have to test it. it wants 156V and has 152Could I do 6 of the clu058's and run them at 2.1, would 2 of the 320 2.1 amp drivers run 3 each then?
Okay let me know, ready to buy! If you have any other configurations that would be similar I am open to that as well. I am just looking for a little better light coverage, having 3 bars with 2 cobs each over the 5 x 9 instead of just 4 cobs total for that space. thanks again!boy thats tight id have to test it. it wants 156V and has 152
with 3 youre right about 150V which is doable. ive personally run 4 in series on a 320-1400 without issue which worked fine for me.I'm thinking of getting started with 3 1825 3500K 90cri run at 80 watts each. My understanding is that they must be run in parallel as the holder is not rated for series voltage, correct ?
with 3 youre right about 150V which is doable. ive personally run 4 in series on a 320-1400 without issue which worked fine for me.
you can run 3 on a hlg185h-48A at 75W ea. a hlg240h-48a (which i dont stock) would prob run them up close to 100W ea
dimming is the same with CC and CV drivers, there are A and B models for both. if you want to run 1825 on a 48V CV driver you need the A model, and its a great match, uses all of the driver with 2 or more cobs on it .
with 3 youre right about 150V which is doable. ive personally run 4 in series on a 320-1400 without issue which worked fine for me.
you can run 3 on a hlg185h-48A at 75W ea. a hlg240h-48a (which i dont stock) would prob run them up close to 100W ea
dimming is the same with CC and CV drivers, there are A and B models for both. if you want to run 1825 on a 48V CV driver you need the A model, and its a great match, uses all of the driver with 2 or more cobs on it .
look at the test report not the datasheet for real-world numbersNot that I don't trust you, but the datasheet of hlg-185h-48A says its maximum is 187.2W, how could it run 3x75w=225w ??
im not sure what driver you are referring to by "the 240". that could mean a dozen different modelsDid you notice the ùax voltage on the 240 is only 51.2V ? ... and same question, how can a 240h run 3x100W when it is rated at max 240W ??
i have some room on those as a lot of light engines is labor, its easier to sit down and make a bunch at onceDo you make discounts o=for light engines if bought in numbrrs ? (21 ?)
look at the test report not the datasheet for real-world numbers
im not sure what driver you are referring to by "the 240". that could mean a dozen different models
i have some room on those as a lot of light engines is labor, its easier to sit down and make a bunch at once
yes @JorgeGonzales has done it, 338 for 4000K. his numbers agreed with some of the LERs that @robincnn got from citizen
https://www.rollitup.org/t/cheap-and-cheerful-diy-using-citizen-cobs.909460/page-13#post-12802292
in fact scroll up on that page and you'll see that @tomate got similar results. whole page has some good discussion
How does any COB have less than 50% efficiency? Where'd you get your numbers? I was pretty sure Bridgelux's Vero, Cree's CXB series, and Citizen 1818s were all in the same echelon, although now Vero's pulling ahead of Cree, who hasn't put any new generation of emitters out lately.Ok
Well then 1818 @84W 4000K 80cri ( 1.62A and 52V using LER 338 ) has:
Minimum efficiency Tj@85° = 31.9%
Typical efficiency Tj@85° = 36.2%
Typical efficienc Tc@25° = 39.6%
Vs 53.45% (?)
Did I miss something because that's like way, way off .. ?
run it hard...How does any COB have less than 50% efficiency?
I suppose, but at 84w? My fixtures are run pretty hard and don't dip below 50%. 85w (92w including fan and such) of light for the Vero, 78w (89w including the fan and such) for the Cree.run it hard...
heres citi calc at 4000k 80cri, 85C Tj:Ok
Well then 1818 @84W 4000K 80cri ( 1.62A and 52V using LER 338 ) has:
Minimum efficiency Tj@85° = 31.9%
Typical efficiency Tj@85° = 36.2%
Typical efficienc Tc@25° = 39.6%
Vs 53.45% (?)
Did I miss something because that's like way, way off .. ?