I have a spot/flood that takes about 5-10 minutes to reach full brightness in the bathroom. Not sure of it's type. It's kinda a blessing and a curse, but the batch has a LED night light with a dark sensor, Whenever you want to clean the bathroom, you have to turn the light on and wait.
I visited a fried that had CFL's in the basement and in an unprotected fixture and a low ceiling,, typical in basements, my head and the light collided. Not good for the CFL.
One 40 W equivalent LED lamp, I purchased, the envelope was so fragile, it did not make it through shipment.
Two 3-way (3-intensities using 3-way socket) LED bulbs by SWITCHLED have been fantastic.