For most of this evening, the one incandescent uplighter in our sitting room was really dim. All the LEDs and CFLs were as bright as usual, but I expect they were taking more current to compensate. Two of them were very reluctant to come on. I suspect the voltage was very low. I would have got a meter out and checked but as we had visitors I didn't think it appropriate. At about 9:30 everything suddenly went back to normal.
Anyone know what was going on?