Hi Jon, how many LEDs do you have in the string? does the forward voltage of the string (sum of Fv of the LEDs) fall within the bounds of the driver? 25-70VDC. I searched the driver, it is indeed a constant current driver, you have chosen correctly.
Hi, i kind of figured something might not have been right, but last night i did see something saying that some drivers will store a high amount of charge when the driver has been turned on but the leds are not connected, then when the leds get connected there is a huge discharge. Not to sure if this might also be the case.
Now back to your question, and thank you for trying to help me sort it.
620-630nm x3
Forward Voltage VF 2.2 ~ 2.8 V @500ma = 2.50v
Power Dissipation PD 1.76 ~ 2.24 W 1.25w =3.75w
440-460nm x2
ForwardVoltage VF 3.4 ~ 4.0 V @500ma = 3.75v
PowerDissipation PD 2.55 ~ 3 W 1.87w = 3.74w
640-660 x4
ForwardVoltage VF 2.2 ~ 2.8 V @500ma = 2.50v
PowerDissipation PD 1.76 ~ 2.24 W 1.25w = 5.00w
740-745nm x2
ForwardVoltage VF 1.8 ~ 2.2 V @ 500ma =1.80v
PowerDissipation PD 1.44 ~ 2.24 W 0.90w = 1.80w
410-420nm x2
ForwardVoltage VF 3.5 ~ 4.5 V @500ma = 3.75v
PowerDissipation PD 2.63 ~ 3.38 W 1.87w = 3.74w
380-390nm x2
ForwardVoltage VF 3.5 ~ 4.5 V @500ma = 3.75v
PowerDissipation PD 2.63 ~ 3.38 W 1.87w = 3.74w
21.77w total.
This was from some calculations i had done on another thread, when connected the single row from the array it used starting from + terminal, 1x 620, 1x 440, 1x 640, 1x740, 1x 640. The interesting thing is it was the 440 led (second in line) that blew.
So looking at the row i used i was only pulling 13.05v, too low hey!! Where if i ran the whole lot i would have been at the 35-45v, in range.
Many thanks for your quick reply last night, but i had turned my pc off and been at work all day.
Regards jon
