Depending on the application, light-emitting diode (LED) lightbulbs have advantages and disadvantages. LED bulbs have just made it to the consumer scene. Some issues will have to be addressed if they are expected to go into widespread use.
The color output for LED bulbs is inconsistent and unpredictable even when they are labeled as "warm white" or "blue white." It may take more time for the manufacturers to perfect their processes.
LED bulb brightness is often rated as an equivalent wattage for an incandescent bulb. Wattage is a unit of power, not brightness. Brightness is measured in lumens.
Over time, an LED bulb's brightness will diminish at some point. Wide fluctuations in voltage usually cause this.
LED bulbs are sensitive to wide voltage fluctuations. A voltage surge can cause them to burn out prematurely.
Because most LED bulbs have multiple LEDs, the resulting light can be grainy (little minibeams on the wall, floor or ceiling).