I refer to this product comment, on these bulbs I have.
[url]RF Interference Problems - Be Very Careful If You Buy These!
Needless to say, the gate receiver mentioned operates at 310 Mhz. Is it even possible that an LED bulb’s rectifier could be generating that much noise?
My gut says yes. I am not an EE.
its not just a rectifier but a switch mode power supply. There are many poor led lamps on the market that transmit rf noise and conduct noise back into the power net 
@ RobvanSchelven - So they have a Switched mode power supply that converts the voltage from 24 volts to what ever the led needs?