Mean Well LDD-1500LW driver and 4 Cree XMl's .... Wiring in series or parallel?
- Thread starter KidFrost
- Start date
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wire in series (+ to -, + to -, etc) and they will each get 1500mA. in parallel (all + together and all - together) and they will split the 1500 to each get 375. remember that your voltage input must be at lest 3 volts higher than the LED string.
I think you have three options.
1) 4S 1500mA each LED 306.9lm 3.14V 4.71W. Total 4 LEDs 1,227.6lm 12.56V 18.84W.
2) 2S2P 750mA each LED 166lm 2.92V 2.19W. Total 4 LEDs 664lm 5.84V 8.76W.
3) 4P 375mA each LED 85lm 2.77V 1.03W. Total 4 LEDs 340lm 2.77V 4.12W.
If you want the brightest output, you should connect them in 4S and the supplied voltage higher than 14V.
1) 4S 1500mA each LED 306.9lm 3.14V 4.71W. Total 4 LEDs 1,227.6lm 12.56V 18.84W.
2) 2S2P 750mA each LED 166lm 2.92V 2.19W. Total 4 LEDs 664lm 5.84V 8.76W.
3) 4P 375mA each LED 85lm 2.77V 1.03W. Total 4 LEDs 340lm 2.77V 4.12W.
If you want the brightest output, you should connect them in 4S and the supplied voltage higher than 14V.
I am powering them with a 20v Max dewalt power tool battery. Not sure how the get 20V from li-ion cells though. 3.7x6 = 22.2V, either way I will be over 14v.
Microa- Can you do the math on 4S 2100mA each for me like you did up here? ^
Might switch to a Buck Puck 0A009-D-V-2100, 2100 mA constant output driver.
Thanks alot for the help!
Microa- Can you do the math on 4S 2100mA each for me like you did up here? ^
Might switch to a Buck Puck 0A009-D-V-2100, 2100 mA constant output driver.
Thanks alot for the help!
A full charged li-ion cell is 4.2V and which should be cut off at 2.5 - 2.8V. So 5S li-ion cells should be adequate. 2.8V x 5 = 14V and 4.2V x 5 = 21V both values are higher than 14V mean that the LEDs are all in current regulated during the whole battery discharging period.
4S 2100mA each LED 400lm 3.26V 6.84W. Total 4 LEDs 1600lm 13.04V 27.36W. Please note the lumen output is at Tj = 25C. You can find your required data at pct.cree.com/dt/index.html
4S 2100mA each LED 400lm 3.26V 6.84W. Total 4 LEDs 1600lm 13.04V 27.36W. Please note the lumen output is at Tj = 25C. You can find your required data at pct.cree.com/dt/index.html
not without photos it isn't!!! 
