Lighting Cob options

[Site]

If i was you i would get a few heat sinks off ebay which i can dig a link out for...i have a meanwell hlg-185-c700a driver you could have for £40 and you could get 10 citizen 1212's from ebay for £90...run 8 of them on the heat sinks and youve got a good light...

Where have you been looking at getting the driver from? I found a few of the larger meanwell drivers at around 110 in the uk but alibaba is the best place for cheapness...

 

[Site]

http://m.ebay.co.uk/itm/Aluminum-Heatsink-Cooling-for-LED-Power-Memory-Chip-IC-Transistor-various-length-Profile-A-146mm-x-/131535356625?nav=WATCHING_ACTIVE&skus=Sectional Dimension (width x height)rofile A - 146mm x 22mm|Length of Heat Sink:700mm|Number of Heat Sinks:3&varId=430907052421

http://m.ebay.co.uk/itm?itemId=222366283299

http://www.mouser.co.uk/Search/m_Pr...HLG-185H-C700B/&qs=%2bmCJZPMmHFM6hb20Dwpriw==

Sorry on my phone so trying to sort some links...could get a 185-c700b for 50 quid new

 

[stonehead]

How about one of these per cob?

• Type: LED driver transformer
• Power: 90W
• Input voltage: 175-265V AC 50Hz
• Output voltage: DC 38V±5%
• Input current: 660mA Max (220V AC)
• Output current: DC 2.4A
• Waterproof: IP67
• PF: > 0.95
• Efficiency: 89% TYP
• Certificate: CE, RoHs
• Body color: Silver
• Material: Aluminum
• Item size: 21.8 * 9 * 4.7cm
• Net weight

 

[stonehead]

And I emailed mouser to see if they allow collection thanks for that.
So 8 of those will that be better than 6 of the 1218 cobs?

 

[Site]

I believe the voltage is too high at 38v you want around 35/36v depending on the COB and what current its going to be run at...

Check the link its pretty cheap..i recently used individual cpu coolers for my cobs but i wish I had just seen those large heat sinks as it would have saved a lot of hassle mounting them to a frame etc...

 

[Site]

I dont know too much about the 1218 cobs but i know the 1212's perform well from what ive been told...others can chime in with much better info and knowledge than me...i just found these bits when i was building my own light...

 

[stonehead]

Just want to pop in and say you guys rock. I remember when DIY was first brought here and the questions went days without responses. All these helpful answers in one thread and done promptly. It's a great thing to see. Keep up the good work

I couldnt ask for more no need to understand it with all this help

 

[stonehead]

So that's a change of plan then. So 8 1212 cobs what would the efficiency be like on that and how would that compare to my 600w hps?

Getting somewhere now

 

[stonehead]

Just thought it would be 4 cobs off 1 driver no?
Original plan was 3 on 1 driver

 

[Site]

It all depends how hard you run them on the driver...an example would be on a hlg185-700 you can get 8 COBs @ 700mA but on a hlg-185-c1400 you could have 4 COBs @ 1400mA...both drivers have the same power ratimg but can power different arrangements...at 700mA they will be more efficient but you need to obviously spend out a bit on double the COBs...

Its all a toss up between how much you want to spend really and how efficient you want it to run...