On Thu, 6 Jun 2019 04:47:22 -0700 (PDT), TimR
wrote:

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

- - - - - - - - - -

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.
With the TV remotes it was the "light" spectrum. With the fan is was
"RF"