On Wednesday, June 5, 2019 at 11:14:35 PM UTC-4, Clare Snyder wrote:
Had a batch of cheap LED bulbs at the office - close to a remote
control ceiling fan. With the lights on the remote didn't work. Would
not have been a problem but the fan power was switched with the lights

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CFLs will do that too. A lot of TV remotes stopped working when CFLs came out. The spectrum of the lamp affects the IR sensor that the remote shoots at.