Hi, hope someone here can help. I got this cool looking 84-LED array at a garage sale for $5 and thought I could use it for a photo light or grow light. No power supply came with it, and the power supply connector is a non-standard size, which leads me to believe the voltage may be non-standard. I cracked open the case and it has 5 banks of 15 LEDs + 1 bank of 9 LEDs connected parallel to each other. In each of the 5 banks there is an array of 5 nodes (3 nodes for the bank of 9) also connected in parallel, each with 3 LEDs connected in series with a 169 Ohm resistor. There is also a small 12v fan connected to a 149Ohm resistor. The PCB is stamped 94v -- 089 LED.
I tested with a 12v power supply, and it gives good light and virtually no heat. I tested with a 24v power supply and it gives great light but gets too hot to hold and gives off slight fumes.
I'm thinking if it was designed for 12v and no heat, why encase in aluminum and install a fan? Must be somewhere in between, right? Can anyone help me with the math needed to reverse engineer this design for optimum light output and longevity? Or should I just go with the 94v? :thumbsup: Obviously trying to solve for voltage and current rating. Photos below.
Thanks in advance!
I tested with a 12v power supply, and it gives good light and virtually no heat. I tested with a 24v power supply and it gives great light but gets too hot to hold and gives off slight fumes.
I'm thinking if it was designed for 12v and no heat, why encase in aluminum and install a fan? Must be somewhere in between, right? Can anyone help me with the math needed to reverse engineer this design for optimum light output and longevity? Or should I just go with the 94v? :thumbsup: Obviously trying to solve for voltage and current rating. Photos below.
Thanks in advance!