Question on CFL and incandescent mix
For about 2 days in a row, while sitting at the computer, I heard a very high pitched whine. Naturally I thought it was the HD going, since it was about 8 inches from my head.
The second night of this though, was giving me a headache so I pushed back from the computer to try to find which direction it came from.
To my surprise, it wasn't the computer, but was at that frequency that it was hard to find which direction it actually did come from.
Then, one of the light bulbs in the light fixture blew out and the whine vanished.
Background: the fixture has 2 bulbs in it, one was an incandescent bulb, one was a CFL. The bulb that was complaining so loudly, was in fact, the incandescent bulb. They are wired in parallel, so the other bulb (CFL) continued to light the room after the one bulb failed.
The question is this: Is it unwise to mix bulbs like this (I only did it because I only replaced the one burnt out bulb with the CFL) ? Did the CLF cause the filament of the incandescent bulb to vibrate at I high frequency and finally burn out? Or was this all just co-incidence?