Posted by ghio on February 22, 2010, 1:04 am
> I sort of figured it out on my own that your 15 LED strip lamp was
> home-made and that you probably made it for bragging rights than
> for money. So who's your LED supplier? Did you ever measure
> the LED's lumen output at a fixed distance over time? Did the
> light output drop after it overheated - or have you figured out a
> clever way to dissipate the heat so the light output is more stable?
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
> Here is another example of real life LED lighting.
> http://s78.photobucket.com/home/GGhio
Posted by ghio on February 20, 2010, 12:57 pm
> 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.
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.
> 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.
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.
> 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_De ...
> how reliable or practicle they eventually will be only time will tell
> > Here is another example of real life LED lighting.
> >http://s78.photobucket.com/home/GGhio
Posted by TKM on March 5, 2010, 9:31 pm
> 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.
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.
> 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.
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.
> 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_De ...
> how reliable or practicle they eventually will be only time will tell
> > Here is another example of real life LED lighting.
> >http://s78.photobucket.com/home/GGhio
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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> home-made and that you probably made it for bragging rights than
> for money. So who's your LED supplier? Did you ever measure
> the LED's lumen output at a fixed distance over time? Did the
> light output drop after it overheated - or have you figured out a
> clever way to dissipate the heat so the light output is more stable?