The LED lightbulbs have an extended portion above the base before the glass portion of the bulb. This built up portion blocked the lightbulb from going into my fixture opening. I tried several brands of LED bulbs with the same result. A CFL bulb has a similar built up portion and also wouldn't fit through my fixture opening.
The portion of the bulb above the base prevented this LED
lightbulb from fitting my electric garage door opener.
Garage door opener with a Chromalux full spectrum lightbulb
installed. I left the second bulb out to illustrate the circular
fixture opening that prevented an LED lightbulb from fitting.
By Jeffrey Gornstein