In the age of the LED light bulb, consumers have an unfathomable range of lighting options. This has, perversely, made the ...

produced by a given amount of electrical energy (watts). The more the lumens per watt the more efficient the bulb.

They are less energy efficient than CFL and LED bulb ... light. A bulb with a high Kelvin rating produces a whiter light, while a bulb with a lower Kelvin rating produces a warmer white.