How long will your LED grow light last and when do you need to replace your grow light? I have tested four lights for PAR output, run them for 6,000 hours and then tested them again in the same setup and with the same equipment. to determine the PAR output drop over 1 year running.
The result is an average of about 5% drop per year and about 20% drop to the end of year 4. I would recommend replacing your LED grow light after a running time of about 25,000 hours.
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