Can you install an LED floodlight in a regular ceiling fan?
All lamps have a size designation which is stated in eights of an inch (1/8").

That particular lamp will most likely not fit in your fixture if it is designed to take a standard A-lamp. That is an R30 size lamp which is 3-3/4" wide. An R20 style lamp (2-1/2" wide) would be more in line size wise with an A-lamp, which is actually an A-19.