SI
SI
discoversearch

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor.  We ask that you disable ad blocking while on Silicon Investor in the best interests of our community.  If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.
Politics : Formerly About Advanced Micro Devices -- Ignore unavailable to you. Want to Upgrade?

To: bentway who wrote (315399)12/13/2006 12:04:47 PM
From: combjelly  Read Replies (1) | Respond to of 1573927
 
"The light is a very "blue" white. I'm not sure I'd want it for normal lighting."

Those are the cheapest. Most white LEDs are white only because they take a blue LED and coat it with a phosphor. The blue light excites the phosphor, which then gives off white light. Applying the phosphor is an expensive step. So when the LEDs are manufactured, they are graded on the color and light pattern thrown. Ones with a heavy blue tint are typically the bottom of the barrel. Ones with a purer white are usually destined for such jobs as backlights for cellphones or flashes for the cellphone cameras.

Now, in the lab, there are quantum dots which give off white light directly. But they are a long way from commercialization.



To: bentway who wrote (315399)12/13/2006 3:11:45 PM
From: Taro  Respond to of 1573927
 
The reason for that very blue white is that the current is too high. A couple of cts saved in the area of the control circuit between battery and LED.


HomeMailHotSubjectMarksPeopleMarksKeepersSettings
Terms Of UseContact UsCopyright/IP PolicyPrivacy PolicyAbout UsFAQAdvertise on SI
© 2025 Knight Sac Media.  Data provided by Twelve Data, Alpha Vantage, and CityFALCON News