Tuesday 9 September 2008
Many of us keep hearing about the wonders of LED lights; how they have life spans of between 50,000 and 70,000 hours, how they use only a fraction of the power that even a CFL requires, and their small size. Why then, are we not using them to light our homes? The answer lies in the type of light emitted by existing LEDs.And the energy is emitted directly as white light, so not as much energy is required. A lot of the light is muted, faded, and doesn't have the crisp white light we enjoy with conventional bulbs... until now.
In the past, LEDs only made one color. Red, green, and blue can be combined to make white, but there may be frequencies missing between narrow RGB bands. Those missing frequencies will make the light seem a bit colorless. It will not make colored objects look the same as if lit by sunlight. Yes, it is possible to quantify what makes white.
LEDs are more efficient at lower wattages and can attain very impressive numbers but the efficiency goes down at higher energy levels. The area where white LEDs will provide benefit is where point sources are needed. Small spot lights like those under cabinets or in track lighting that illuminate something like a wall portrait don't really work with CFLs. CFL lamps are a very general soft source of light and aren't good for projecting a beam. They also are impossible to make very small. As you know, LEDs can be very small and cool while making a respectable amount of light. CFLs always will need a ballast which makes them large.
And we've talked so much about the UFO the whole centuty, but it's my first time to hear that it use LED to light it's route! Unbelievable! Does it? But I've just caught a UFO weirdy!
