Well, here are a few good reasons.
Incandescent lights heat a metal filament that radiates light inside a glass bulb.
They radiate white light, which consists of a wide spectrum of electromagnetic radiation. Incandescents generate high-intensity light for a short operating lifetime and are susceptible to damage from shock, vibration and temperature extremes. LEDs are semiconductors which require 3.6VDC and use approximately 20 milliamps of current. The cathode is easily distinguished by its flat surface referred to as the anvil, home to blue gallium nitride chip. The chemical composition of the LED determines the color of the light produced.