I switched my main kitchen light from CFL to LED several years ago. It is a Phillips, and puts out a nice warm light. It cost $47 (ouch), but I really wanted to try it. It comes up to full brightness more slowly than the CFL it replaced. I read there is a current limiter in the circuit to cut down on voltage spikes during warm up in order to increase life of the driver circuit. Not sure, but it is a long wait for full brightness.
My PAR replacement LED was very pricey too, but it comes up full output like an incandescent. I love it and it doesn’t get near as hot as a PAR in a recessed spot fixture.
I’m not sure about the LEDs but the ‘current’ limiter in the CFL is the ballast or negative resistance device whose function is to limit current to the tube while still maintaining the voltage needed to “light up” gas.