By now, many householders have changed previous, no-longer-made incandescent lightbulbs with LED or CFL ones. This implies that, as an alternative of the watts device, the standard of sunshine emitted via those new bulbs is measured in Kelvins. In basic, for too-dark rooms, “look for bulbs that are 5,000 Kelvins, which mimic daylight and give a whiter light,” says Speck. “It can make a room feel bigger and brighter.”