To answer that, we'll have to understand the different lighting options:
* compared to incandescents, LEDs emit energy mostly in the visible spectrum of light, while incandescent lights emit light mostly in infrared. Since incandescent light emits light in a manner similar to black body radiation, the variance of emitted light is quite wide, and visible light can only be a small portion of it.
* Fluorescent lights work by absorbing one wavelength of light emitted from high voltage electrons shot though different gasses. The light discharged by the gas is typically UV, and is absorbed with fluorescing chemicals, which re-emit it into visible light. However, no gasses emit only UV, so much of the light is lost instead of being converted by the chemicals.
* LEDs work when the electrons and electron-holes in a diode meet up in the P-N junction. This means the electrons jump to a lower orbital, causing them to release their energy in the form of light. This actually works for all diodes, but most semiconductors re-absorb the light, the materials aren't the most efficient for it, or don't emit in the visible range. However, it's more direct in its conversion of electricity to light and emits mainly one frequency.
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