Simple test RFI tests for fluorescent bulb replacement
A FM radio tuned to a weak station may indicate if there is interference, and tuning it to a frequency with no station may also work as detector. Muting must be switched off. An AM radio can likewise detect interference in lower frequency ranges. 

LED bulbs/lights often are a big source of problems concerning RFI. Due to the pulse width modulation in the LED power supply, a wide frequency range is emitted if no filters are used in the LED electronic. There are cheap LED bulbs with a simple RC- network as power supply resulting in less interference, but they flicker - visible by quickly moving a finger or pen up and down in front of them.

When shopping LED bulbs, a RFI test can be performed with the radio (and earphones as antenna) that comes with many smart phones, but a muting switch is often missing.
When purchased via Internet, LED bulbs can be tested at home and sent back if they fail.