If relocating the light relative to the other equipment does not cure the problem and you want to stay wireless try using the thinnest metallized mylar sticky tape you can find. Should act as a Faraday cage absorbing EMF from the switching transistors in the power supply of the lamp. Try shielding just the power supply first. Check www.alliedelec.com for a local supplier. Or tape aluminum foil around the EMF source. Geeky but simple.