Sanitas Vibrationum
Active Member
I have 16 1212's sitting around hoping they still get deployed while I'm messing with QB's.
I'm using Rapids 140 Pin and their extrusion for my Cob needs and was thinking about best way to utilize those heat sinks. I suck at all this PPFD umol calculations yet, but here is what I finally decided that I hope makes sense:
1 140 Pin heatsink - $19
3x 1212 per heatsink ~ $30
arctic silver and misc - another few bucks.
total cost of the engine ~ $55
now, if I use V29 with 140 pin like I had before - cost will be approximately the same, but will have to run single v29 harder to justify such a big heatsink.
I have a feeling that 3x 1212 at 0.7a (75W) will be overall more light than let's say V29 at 1.4A (50W) due to 1212 having slightly higher efficiency at that low current? If this is the case - scaling up with 1212's may be the way to go? Lets say we are use 185h-c700a for 6 1212 on 2 140 Pin (150W) - total cost ~ $125, and on the other hand - 185-c1400 to drive 4 v29's on 4 Pin (200W) - total cost - $230. Then we move up to 240h 700/1400 and numbers are: 3pin with 9 1212 and a driver (225W)- $211 or 5x V29's at 1.4 + 5x pin heatsinks and a driver (250W) - $295 and so on.., bumping down 1212 build down to 0.5A may be even better way to go... ? I hope I do my math right
I'm using Rapids 140 Pin and their extrusion for my Cob needs and was thinking about best way to utilize those heat sinks. I suck at all this PPFD umol calculations yet, but here is what I finally decided that I hope makes sense:
1 140 Pin heatsink - $19
3x 1212 per heatsink ~ $30
arctic silver and misc - another few bucks.
total cost of the engine ~ $55
now, if I use V29 with 140 pin like I had before - cost will be approximately the same, but will have to run single v29 harder to justify such a big heatsink.
I have a feeling that 3x 1212 at 0.7a (75W) will be overall more light than let's say V29 at 1.4A (50W) due to 1212 having slightly higher efficiency at that low current? If this is the case - scaling up with 1212's may be the way to go? Lets say we are use 185h-c700a for 6 1212 on 2 140 Pin (150W) - total cost ~ $125, and on the other hand - 185-c1400 to drive 4 v29's on 4 Pin (200W) - total cost - $230. Then we move up to 240h 700/1400 and numbers are: 3pin with 9 1212 and a driver (225W)- $211 or 5x V29's at 1.4 + 5x pin heatsinks and a driver (250W) - $295 and so on.., bumping down 1212 build down to 0.5A may be even better way to go... ? I hope I do my math right
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