Diy 40w chip led help wanted...
- Thread starter nanomania
- Start date
oreo57
Well-known member
A chip like that is generally 10 in series, 4 parallel rows.. 1W diodes..
Driver will depend on chip specifics..and at what current you want.
You NEED to match the driver to the chip (V(f) and current wise
Any constant current driver w/ approx 36V max output should work.. The current setpoint will determine the current to each parallel string
At 1500mA each 10 diode row will run at 1500/4 mA =375
Multiple drivers won't work
The V(f) required is a)depends on the diode and b)depends on what current you want to drive them at.
Those diode V(f) range is usually approx. 3-3.6 (x10 = 30-36V) which is why you see the drivers @ the ratings you do..
You NEED to match the single driver to the chip .....V(f) and recommended current.. watts will follow..
The above is an EXAMPLE and may or may not apply.. but is based on "common practice"..
Last edited:
nanomania
New member
oreo57
Well-known member
That is a stupid way to list the chip AFAICT BUT the first important thing is 1)use a constant current driver 2)Make sure it outputs this voltage:
3) Pick a current you want to run it at....
THe 30,40,50 W designation only decides how bright (and hot) the chip runs..
Basically they "recommend" 1200mA constant current..
2 different "40W" drivers.. note the constant current differences..
http://www.ebay.com/itm/40W-1000mA-...454?pt=LH_DefaultDomain_0&hash=item27f011caf6
http://www.ebay.com/itm/40W-1500mA-...844?pt=LH_DefaultDomain_0&hash=item27f011d44c
Dimmable (20k pot or 0-10v "signal") and 1050mA
http://www.ebay.com/itm/Autec-Power...167?pt=LH_DefaultDomain_0&hash=item3a8e4b7997
Any will work fine.. Pick a drive voltage in the cip range and a current you want to run it at.. Watts will follow..Technically you don't "need" a 40W driver.. sounds odd but it is right AFAICT.
oreo57
Well-known member
Most of those Chinese drivers are dual voltage..
I can't tell you what to buy..
But I can tell you the specs look fine..
If "I" was to buy one, "I" always go for a dimmable driver...
nanomania
New member
http://m.ebay.com/itm/400710096493?nav=SEARCH
http://m.ebay.com/itm/300938777002?nav=SEARCH
ARE THESE OK FOR ME? just found them on ebay...
http://m.ebay.com/itm/300938777002?nav=SEARCH
ARE THESE OK FOR ME? just found them on ebay...
oreo57
Well-known member
If it were me I'd not buy a driver that ouputs more than 1000mA. simply because when you try to max those multichip LED arrays out one of the strings will end up pulling more than it's rated 350mA and be very likely to burning out. Once one goes the rest follow shortly after.
I'd go even lower unless you have a very hefty heatsink to keep things cool. 700-900mA would be the range that I would run that chip at if I wanted to ensure it would last...
I'd go even lower unless you have a very hefty heatsink to keep things cool. 700-900mA would be the range that I would run that chip at if I wanted to ensure it would last...
oreo57
Well-known member
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