While I love the lights, I had similar problems mentioned by other reviewers in both sets I bought. When they would turn on, the lights would flash on and off similar to a strobe light for approximately 5 minutes before finally turning on. Following advice from another reviewer I made a cylinder shield for the sensor to fix this issue. I used 1/2" plastic conduit and epoxy. Now that I have that problem fixed, the light output is fantastic.
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