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Posted by ghio on February 22, 2010, 1:04 am
 



Ambient - 22.5C
Lamp off - 22.5C
Lamp on for fifteen minutes - 30.3C


Posted by Josepi on February 20, 2010, 5:45 am
 


This week I saw a demo board at a local hardware store, tooting 3W LED
lamps. The unit was between two 7W CFL lamps and you could not detect any
light coming from the LED unit despite my hand as close to the projection of
the LED lamp as I could get.

What a joke. I am not impressed with LED lighting for general lighting, at
all. LED bulbs also have heat problems that shorten their lives, depending
on mounting and enclosure. Not quite ready for market yet.


The blurring of the reflected light off the desk makes it look like
the photo was done with high ISO and a long shutter setting.

however,
LED desk lamps are available as the following...

http://www.environmentallights.com/products/12283/DL2_LeMaster_LED_Desk_Lamp

how reliable or practicle they eventually will be only time will tell




Posted by ghio on February 20, 2010, 12:57 pm
 


So, maybe you should shop somewhere else. I saw a lamp today with a
fifteen led strip light between two 7 watt fluorescents. The general
consensus was to scrap the fluorescents.


Luddites  are found everywhere. Two years ago my house was all
fluorescents and QH. Today 80% of those lamps have been replaced with
LEDs. The other 20% are applications where a LED lamp has not been
found that can do as well or better than what is there.  To date I
have had no problems with heat.


Posted by TKM on March 5, 2010, 9:31 pm
 



So, maybe you should shop somewhere else. I saw a lamp today with a
fifteen led strip light between two 7 watt fluorescents. The general
consensus was to scrap the fluorescents.


Luddites  are found everywhere. Two years ago my house was all
fluorescents and QH. Today 80% of those lamps have been replaced with
LEDs. The other 20% are applications where a LED lamp has not been
found that can do as well or better than what is there.  To date I
have had no problems with heat.

There are some good LED lamps and luminaires.  The best residential
luminaires are at:  http://www.lightingfortomorrow.org/publications.shtml  
Download the "SSL Winners Brochure" for 2009,08,07 and 06.  All of the
luminaires including the drivers and LEDs were tested by the DOE for light
output, color, temperature, drive current, etc.  There will be more winners
announced later this year including LED screw-ins for incandescent and
incandescent halogen lamps.  Energy Star is the only rating system that I
know of that uses the right test criteria to rate the quality of LED
lighting equipment from a practical standpoint.

TKM





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