{ "numMessagesInTopic": 16, "nextInTime": 2203, "senderId": "o8sVVLjYP7gRPJYNzdNdd7d3gvo0x0a6CImShCJOiwpDpyPSElpSDVabtrxu9-MA_KP8O8tqS9mWbhT62XxECnwxRf1qEEppacyLQB0_", "systemMessage": false, "subject": "Re: my vp2290b back light", "from": ""educationk12" <educationk12@...>", "authorName": "educationk12", "msgSnippet": "The MacBook Pro series are suppose to get a less power hungry LED backlights to replace the current non-led display. They are suppose to ship when Leopard", "msgId": 2202, "profile": "educationk12", "topicId": 2178, "spamInfo": { "reason": "6", "isSpam": false }, "replyTo": "LIST", "userId": 247597564, "messageBody": "
--- In IBM_T2X_LCD@yahoogroups.com, "Paul Grace" <paulgrace@...> wrote:
\n>
\n> I'm no expert, but I believe:
\n>
\n> Efficiency can be defined as the brightness divided by the heat, so LED
\n> streetlighting is hotter than low pressure sodium for a given
\nbrightness,
\n> because it's lower efficiency.
\n>
\n> 20 Watts LED is just as hot as 20W of CCFL (or even 20W of Halogen).
\n LED
\n> and CCFL are similar in efficiency, but the CCFL radiates over a larger
\n> area, so it's probably easier (cheaper) to make an even backlight, and
\n> probably fewer lamps are needed for that reason.
\n>
\n> FYI, white LEDs are actually phosphor lamps, and have a limited life,
\n> similar (but superior) to CCFL.
\n>
\n> _____
\n>
\n> From: IBM_T2X_LCD@yahoogroups.com
\n[mailto:IBM_T2X_LCD@yahoogroups.com] On
\n> Behalf Of fluppeteer
\n> Sent: Monday, January 22, 2007 12:38
\n> To: IBM_T2X_LCD@yahoogroups.com
\n> Subject: [IBM_T2X_LCD] Re: my vp2290b back light
\n>
\n>
\n>
\n> :-) I gather that white LEDs are getting more efficient, and
\n> (if they haven't already) are expected to cross over to being
\n> more efficient than CCFL in the next few years.
\n>
\n> The ones I've heard of certainly get hot. The high brightness
\n> LED torches I have certainly get warm, and I read an article
\n> on LED street lighting that was mostly about cooling it (one
\n> way to wind up astronomers even more, since low pressure
\n> sodium is both pretty efficient and easy to filter... I've
\n> started to take an interest in the subject, but I'm being
\n> put off by how much LPR filters cost!) - also the BrightSide
\n> LCD panels had active cooling for the backlights. They were
\n> *very* bright, though.
\n>
\n> --
\n> Fluppeteer
\n>
\n> --- In IBM_T2X_LCD@ <mailto:IBM_T2X_LCD%40yahoogroups.com>
\nyahoogroups.com,
\n> "educationk12" <educationk12@>
\n> wrote:
\n> >
\n> > Hmmm, so I guess this means more heat, too? Which means more fan power
\n> > needed? Oh well, so much for my perfect world bubble.
\n> >
\n> > MD
\n> >
\n> > --- In IBM_T2X_LCD@ <mailto:IBM_T2X_LCD%40yahoogroups.com>
\n> yahoogroups.com, "wilsoncca" <wilson@> wrote:
\n> > >
\n> > > On the contrary, LED backlights consume more power than CCFL ones.
\n> > > Compare the NEC LCD2180 to the LCD2190. The LED-backlit 2180
\nconsumes
\n> > > 100W while the 2190 consumes only 50W. Another example is the Sony
\n> > > 52XBR2 vs. the LED-backlit 70XBR3. The 52XBR2 consumes about
\n> > > 0.2W/in^2 while the 70XBR3 consumes aboue 0.33W/in^2.
\n> > >
\n> > > --wilson
\n> > >
\n> > > --- In IBM_T2X_LCD@ <mailto:IBM_T2X_LCD%40yahoogroups.com>
\n> yahoogroups.com, "educationk12" <educationk12@>
\n> > > wrote:
\n> > >
\n> > > > If IBM came out with a DG6, then it'd be nice to have an LED
\n> backlight
\n> > > > which would probably eliminate the need for the two semi-noisy
\nfans
\n> > > > which most likely consume a combined 30 to 40 watts of power.
\n> The T221
\n> > > > uses around 150 watts of power, puts out quite a bit of
\nheat...I bet
\n> > > > the power usage could be cut in half. It'd provide a longer life,
\n> > > > better viewing, quieter and less heat.
\n> > > >
\n> > > > MD
\n> > > >
\n> > >
\n> >
\n>