On 11 May, 17:40, Jeff Liebermann wrote:
On Mon, 11 May 2009 12:12:08 +0100, "Arfa Daily"

wrote:
...but is it right to
actually call these "LED TVs" ? Seems like a bit of a deliberately
misleading use of the terminology to me - or is it maybe just me being a
picky grumpy old sod ? * *d:~)

Do you really want an LED screen very high res has pixel pitch of 5mm
so it does help to be on other side of football field for viewing.

Sure. *You've just been LED astray.
(Sorry, I couldn't resist).

I notice that Samsung's web pile conveniently does NOT mention
anything about the technology used in their Luxia line of TV's.
They've even dropped the Luxia name, preferring to use "LED TV"
instead. *My suspicious mind suggests that this seems intentional.
http://www.samsung.com/us/productsubtype/led/

Perhaps it would be helpful to refer to Samsung TV's by their
backlighting. *The ordinary LCD panel TV can be known as "CCFL TV".

Added sci.engr.lighting

As for improved efficiency, I'm wondering if that's true. *CCFL lamps
belch about 80-100 lumens/watt. *

Don`t think they do, very good fluro mebbe but don`t think cold
cathode gets an A for efiiciency.

Typical white LED's do 10-20
lumens/watt. *

Someone needs to get a modern white LED, even out the front fixture
efficiency is above 50 lW nowadays

Adam


http://en.wikipedia.org/wiki/Light-emitting_diode#Efficiency_and_oper...
http://en.wikipedia.org/wiki/Fluorescent_lamp#Luminous_efficacy
To get the same light output, LED's need to about 4-5 times as much
power. *If Samsung used the new and recently demonstrated high
efficiency white LED's, at 100 lumens/watt efficiency, they would at
best be equal to the efficiency of CCFL. Unless my arithmetic is
faulty, an common white LED backlit TV would belch MORE heat than a
CCFL backlit TV for the same brightness. *In addition, the smaller
physical size (thickness) of the LED backlit TV leaves less area for
ventilation and conductive cooling. *Looking back at the
"specifications" pages, on the Samsung web pile, I don't seem to find
a power consumption figure. * Oh-oh....

--
Jeff Liebermann * *
150 Felker St #D * *http://www.LearnByDestroying.com
Santa Cruz CA 95060http://802.11junk.com
Skype: JeffLiebermann * * AE6KS * *831-336-2558