On Sat, 21 Jan 2017 21:44:35 +0000, alan_m
wrote:

On 21/01/2017 20:44, Scott wrote:


As a follow-up I see there are some EMI free bulbs advertised. I
won't post links as some might then question my motives. They seem to
be lower-powered and DC.


Unless you are running them from a 12V DC source, say, on a boat,
caravan etc. you may just be moving the problem to the external power
supply you have to fit to drive the DC bulbs

Thanks, but the power supply is okay. I have three toroidal
transformers presently used with the halogen lamps and they do not
cause interference problems. The problem would be converting to DC
and I wonder if this could be done without using these switched mode
devices (that I still need to read up about).