Low Current Lights?
- Thread starter evilcubed
- Start date
AnAppleSnail
Flashlight Enthusiast
What's your voltage? One led die at 10,mA gives around 30mW, or almost 8 lumens. Doubling the voltage to run two LEDs with the same current you double that output. But that's awfully dim for a whole room.
AnAppleSnail
Flashlight Enthusiast
Are we assuming 1600v feed now? Yikes.
AnAppleSnail
Flashlight Enthusiast
Running 400 LEDs at 24v sounds more like an 80P5S array consuming (80x7 mA) or 560 mA. I'm not sure what he meant with the 10mA limit either.
I meant that each LED had a drive current of 7ma's, I would have to pull the light and recount how many string it had. I meant to reply last night when I got up for work but it had to wait until I got done with work to reply. I have not fired that experiment up in a while but I seem to remember that it had a lot of flood.
a single 5mm LED in a dark room, with adjusted eyes would be enough to light the room. However I'm not sure if thats exactly what the threadstarter was talking about.
http://www.amazing1.com/products/Transformer-3000V-10mA.html
a 20mA short circuit current would mean you could use that to drive as many 5mm LEDS as you wanted, as long as you had less thatn ~900 or so. ;)
http://www.amazing1.com/products/Transformer-3000V-10mA.html
a 20mA short circuit current would mean you could use that to drive as many 5mm LEDS as you wanted, as long as you had less thatn ~900 or so. ;)
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idleprocess
Flashaholic
If the original poster has a lot of voltage to work with, then 7mA can indeed light a small room very well. If they have only enough voltage to power a single LED ... not so much so.
If we have a relatively efficient 100 lm/W LED, then a single ~3.6V white commodity low-power LED @ approximately 25mW could hit around 2.5 lumens. If we can swing 36 volts and string 10 LED's in series, we get 10 times the power and ten times the lumens (25). If we're working with 120 volts AC efficiently converted to DC, we could roughly triple the LED's and see 75 lumens. 240V would double that lumen output again ... and still be less output than a 40W incandescent.
If we have a relatively efficient 100 lm/W LED, then a single ~3.6V white commodity low-power LED @ approximately 25mW could hit around 2.5 lumens. If we can swing 36 volts and string 10 LED's in series, we get 10 times the power and ten times the lumens (25). If we're working with 120 volts AC efficiently converted to DC, we could roughly triple the LED's and see 75 lumens. 240V would double that lumen output again ... and still be less output than a 40W incandescent.
