This round LED golf ball bulb (so-called for its distinctive shape) requires just 5.5W of power to produce light of an equivalent quality and brightness to that of an old-fashioned 40W filament bulb. Its versatile design enables it to directly retrofit to existing installations, despite boasting a longer rated lifetime and far superior efficiency than the incandescent bulbs it is designed to replace.One of the principle benefits of LED technology is the way in which it manages to produce light in the absence of heat - something that incandescent bulbs heavily rely on. Using heat to produce light in this way is grossly inefficient and places untold levels of stress on the bulb\'s components. Bulbs that employ such technology expend nearly 90% of their energy on generating heat alone and thus burn out much quicker. LED technology effectively reverses this ratio, with 90% of a bulb\'s energy committed to its primary function of generating light with only 10% lost as heat.To improve these proportions yet further, this LED golf ball sports a thermal plastic shell that dissipates any cumulative heat even more effectively than the glass and non-specialist plastics that encase other LED bulbs. This results in a bulb that is more durable, efficient and aesthetically pleasing.In some instances where this specific bulb is unavailable, an equal or higher spec version from another brand may be supplied.15,000 hour rated lifeBC-B22d fitting2700K Warm White470 lumens40W incandescent equivalent