[opendtv] More on LED replacements for bulbs
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: "OpenDTV (E-mail)" <opendtv@xxxxxxxxxxxxx>
- Date: Wed, 6 Oct 2004 18:02:43 -0400
This is pretty cool stuff. Using three LED colors to
create white light, instead of the blue LED with colored
phosphor filter described in a previous article on this
subject, the user can in principle tune the light to his
own preferences. Certainly nicer than what you have to
accept with fluorescent lighting, for example, when
using fluorescent replacements for incandescent bulbs.
For the price premium you pay, how hard would it be to
offer a set of user-selectable bases for these lights,
with resistors sized for different white balance? Fun
stuff.
Sounds like the examples they're describing have
a regular Edison base screw attachment. Looking
forward to when they appear at my local Lowe's.
Bert
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Energy-saving LED bulb cuts light costs 80 percent
By Spencer Chin , EE Times
October 06, 2004 (11:05 AM EDT)
URL: http://www.eet.com/article/showArticle.jhtml?articleId=3D49401040
MANHASSET, N.Y. - Lighting Science Inc. (Fort Lauderdale,
Fla.) has introduced an environmentally friendly LED bulb
that reportedly slashes light costs by 80 percent
compared to incandescent, fluorescent, and other LED bulbs.
The technology, called Optimized Digital Lighting (ODL),
utilizes a patented LED (light emitting diode) bulb that's
designed to generate less heat than other bulbs while
delivering 30 percent greater light output, according to
the company.
Lighting Science said an ODL R-30 bulb consumes only 5.6
watts and can replace 65-watt incandescent and 15-watt
fluorescent bulbs. Compared to existing incandescent units,
the ODL lamps reduce energy usage by almost 90% for the
same end lumens, with a useful life up to 25 times longer
(50,000 hours).
Relative to fluorescent lighting, ODL units reduce energy
usage by as much as 50%, said the company. The bulbs use
the same light fixtures as incandescent and compact
fluorescent bulbs.
The bulb has one significant catch-it costs $33, compared
to $3.50 for a standard R-30 incandescent floodlamp. But
with a standard R-30 lamp rated to typically last only
2,000 hours, the user would have to purchase 25
incandescent bulbs to obtain the equivalent lifetime of
an ODL bulb, according to Lighting Science.
LED technology has been long used for indicator lamps in
electronic components and as signaling devices, such as
traffic lights and automotive taillights. However, the
historically high initial cost of LEDs, coupled with
their lesser light quality, limited functionality, and
appearance have delayed their widespread use for general
illumination purposes.
The ODL bulb's heat-saving design helps it to run cooler
while lasting longer and producing better light quality,
according to Fred Maxik, inventor and chief executive of
Lighting Science. The bulb uses 30 percent fewer LEDs
than other LED bulbs, thus lowering ownership cost,
Maxik added.
In addition, the LED bulb has no filament unlike
incandescent bulbs, further extending useful life.
Another drawback to LEDs, color shift, was solved by
using red, green, and blue LEDs to produce a white light.
Other LED approaches that use costlier blue or
ultraviolet LEDs with a phosphor coating experience color
shift because the phosphor coating tends to degrade over
time, according to Maxik.
"The LED lighting market has been ripe for this kind of
approach," said Maxik in a statement. Maxik added he has
spent a lifetime taking high-priced technology apart and
figuring out how to put it back together again to
deliver higher performance at lower cost.
Capable of emitting either warm white or ambient light,
the ODL bulbs are available in a "T" shaped design for
use in recessed canisters or a stylized cone-shaped bulb
for lamps, track lighting, or other fixtures where the
entire bulb is visible.
Copyright 2003 CMP Media
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