Hello guys!
i am in a project of reaplacing 2 x 600w hps with CXA3070 build.
one lamp will be reaplaced by 16 COBs, mounted on four 39" long, 4.23" heatsink. stream of four COBs per bar, powered by MW HLG-120H-C1050B on each bar.
the second lamp will be reaplaced by 9 COBs, mounted on three 36" long, 4.23" heatsink.
the goal is that each build will use about 600w, with dimming option.
each one of the bars should be able to operate on it's own, and will have two 92mm fans, and small spu\adapter for the 12v fans
first build - each bar - 4 x 3070 at 1050mA, each COB - 36.25 vf, 38.06 W. total vf for the bar - 152.24
total consumption of the build - 608.96 W - good.
i am planing to use this for dimming -
http://ac-rc.net/catalog/product_info.php?products_id=254&osCsid=ahor43emk4cakpgt76uivop3a3
do you think it can work with the HLG-120-1050, driving four 3070 in stream? the HLG data says it can only be dimmed down to 525mA, but in the video it looks like the guy is dimming all the way.
i choosed this dimmer coz it look easy, and you have the LCD display so you don't have to guess where you are, or use multimeter.
this video shows how it works -
i will use one of this adapter for the fans, and drew the dc power for the dimmer from there.
adapters -
http://www.aliexpress.com/item/10pcs-DIY-Mini-LED-Power-Supply-AC-DC-Adapters-6W-500mA-Driver-100-240V-To-12V/1899950974.html
http://www.aliexpress.com/item/1pcs-Durable-Universal-12W-LED-Driver-100-240V-50-60Hz-1A-Light-Lamp-Lighting-Transformers-12V/32221338331.html
do you think it's a good idea to use PWM dimming? or there are better options? i have read allmost everything about DIY led here, but i still can't figure out how the dimming works, or what parts i have to buy for set up a dimmer.
i have looked at this link that was posted here, but it all looks like chinese to me -
http://www.allelectronics.com/make-a-store/category/470050/potentiometers/6mm-shaft/1.html
for the second build i have a driver question -
as this build is only 9 COBs, 3 on each bar, they should operate at higher current in order to achive the same 600w as the first build.
so i guees each COB has to be driven at 1750mA, so about 67w per cob, 606 w for the 9 of them.
i wanted to do the same as with the first build, one driver per heatsink bar, driving the COBs in stream. but i couldnt find driver at thet current (1750mA) who is also able to drive the stream of 3 CXAs - their total vf is about 114 vf.
there are some options for driving each COB with small dimmble driver at that current, like the HLP-80H
http://www.meanwell.com/search/HLP-80H/default.htm
but at 40$ per driver, multiply by 9, that too much money.
so i think i will go with 9 cheap EBAY drivers, it's only 10$, and free shipping.
they are not dimmble, and only 1500mA, so the build will drew about 507w
does anyone have experiance with those drivers? it's the same logo on all.
http://www.aliexpress.com/item/2014-new-promotions-lowest-price-50W-1500ma-Flood-Light-Power-Supply-High-Power-LED-Driver-DC/1933707929.html
http://www.ebay.com/itm/50W-Watt-High-Power-LED-Driver-AC-110-265V-50-60HZ-Waterproof/131274527292?_trksid=p2047675.c100011.m1850&_trkparms=aid=222007&algo=SIC.MBE&ao=1&asc=20140602152332&meid=d52be122173c4f83acd3b37630d1c771&pid=100011&prg=20140602152332&rk=5&rkt=10&sd=160927171811
http://www.ebay.com/itm/New-50W-Watt-High-Power-LED-Driver-AC-110-265V-50-60HZ-Waterproof/271521164083?_trksid=p2047675.c100011.m1850&_trkparms=aid=222007&algo=SIC.MBE&ao=1&asc=20140602152332&meid=d52be122173c4f83acd3b37630d1c771&pid=100011&prg=20140602152332&rk=1&rkt=10&sd=160927171811
another option i found for lighting the stream is the inventronics EUC-320S210DT(ST)
at 2100mA it's provide 76-152 vdc, enough for 3 CXAs, and is dimmble.
http://www.inventronics-co.com/upload/EUC-320SxxxDT(ST)_2014101405165109311.PDF
only problem is, it's not availble anywhere. i don't understand why they do things if nobody sell them.
so if someone has an idea for powering this stream, i will be happy to know - thanks!!
and special thaks to supraSPL for this thread