Compared to incandescent lightbulbs, LEDs produce a lot more lumens per watt ... one enclosure. Some of the more advanced individually addressable RGB LEDs even add a fourth LED, for white.

More than one ... White-light sources based on reliable and energy-efficient LEDs have only recently been made possible through developments in semiconductors (Fig. 1 shows a white-light LED ...

The colour temperature can be adjusted between a 4000K cool white ... TRADFRI LED E14 806 lumen bulb is available in numerous European countries, such as the Netherlands and Italy (€13.99 ...

Ballast manufacturers are located across the United States and around the world. They adhere to a variety of standards, including guidelines from organizations such as the American National Standards ...

When they reach the end of their long evolutions, smaller stars—those up to eight times as massive as our own sun—typically become white dwarfs ... are predominantly cool, but its core ...