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What is the thermal resistance of UV-C LEDs?
I have a UV-C air cleaning product that I'm exploring switching my source of UVCs to another company due to the LED board overheating. Your product caught my eye. What is the thermal resistance of the LEDs? The specs say you can cut the LEDs every 0.7 inches. So if I wanted to make two strips out of the 1-meter long roll, would I need to do any additional wiring or could I use the connector on either side to do the wiring? In this case, would each strip still be 12V but at half the power consumption?
We do not specify thermal resistance values for our UV-C LED strip lights and instead rely on case temperature specifications for thermal management, as defined as a maximum circuit board surface temperature of 85°C (185°F).
You are correct that the LED strip lights can be cut in 0.7-inch intervals. The 1-meter reel includes a DC connector on both ends, so the 1-meter reel can be cut in half and you would have two fully functioning strips of 0.5 meters each.
The power consumption for each 0.5-meter section would be 7.2 watts, which as you correctly mention is half of the full 1-meter reel (14.4 watts).
Back to the thermal resistance. Do your other customers need to use heat sinks to run the LEDs? I plan to test these out in my air purifier so there will be air rushing by them on the LED side, I'm just wondering if the VHB is on the back and they need a heat sink, I'd imagine VHB acts more like an insulator. I'm asking as I've had heat issues with other manufacturers, I wouldn't want these to get anywhere near 85 degrees C if I could help it.
You are absolutely right that the 3M adhesive is not a great thermal conductor and impedes thermal transfer. That being said, the LED strip lights are not driven to their maximum ratings and would not require any special thermal management to keep them below 85 C. Our anecdotal observations suggest that the LED strips have a temperature rise over ambient of approximately 30 C without any heatsinking.
For the 40 uW/cm^2 power density value @ 6 in. I was trying to match this up with the irradiance graph you had. Is each block vertically in this graph 1 inch away from a single LED at the top middle?
Yes, that is correct, each square represents 1 inch. You can also reference the semi-circle radius rings as a distance marker reference.
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UV-A LED strip lights