LED bulbs are notoriously bad for RFI - I suggest that you find out what sort of bulb he has and offer to replace them for free with ones that do not generate RFI (a trip to home despot and a quick try in your home fixture should help find a good bulb).
Gary Johnson WB9JPS , has done a fair bit of testing using an LISN with a spectrum analyzer and offers the following:
RECOMMENDED FOR AMATEUR RADIO STATION USE Probably undetectable at most ham stations
Feit 75W eq. dimmable LED PAR30 flood lamp, medium base
Feit 100W eq. dimmable LED bulb, medium base
GE 65W eq. dimmable BR30 flood lamp, medium base
Lights of America 8140SE2-WH5 4-foot LED shop light (reported by W1VLF, ARRL Lab)
BORDERLINE (or OK after some user modification/filters)
Cree 100W eq. dimmable LED bulb, medium base
NOT RECOMMENDED Avoid these.
Elite RL675 8-inch flush LED light fixture
Commercial Electric 5- or 6-inch flush LED light fixture
Torchstar LSDDL-19W6D50 6” LED recessed retrofit (reported by K6OK)
- Glenn W9IQ