- Jan 1, 1970
I repaired an outdoor dusk/dawn LED lamp that had a defective LDR used to switch the LED on/off. Problem was the LDR resistance read low (10K)in darkness, so I replaced it with one I had laying around and got it working. Since then (don't know how long) the same problem has returned with the LDR resistance again reading low in darkness. I checked a few LDRs in my spare parts and found one that also read low in darkness, which had never been used.Do these things go bad over time, and do they deteriorate sitting in the sun all day?