The heat sink helps to circulate and dissipate the large amount of heat created by LEDs. Most solidly performing units opt for “passive” heat sinks, meaning there no moving parts so no chance of the cooling mechanism failing. However, most heat sinks lay flat at the bottom of the unit, under the LED mechanism. In such positioning, gravity takes hold and the air moves up first, directly into the backside of the LED mechanism. It will eventually disperse, but not without needlessly heating the LED first. MarQuee LED is different, because the LED and heat sink are perpendicular to the bottom of the unit, air moves more freely and the LED mechanism remains cooler.