Color changing LEDs
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From: Andrew Rossmann on 6 May 2010 16:41 In article <itn4u5pa3i931073b6j2tmo715onovnd9o(a)4ax.com>, mister_friendly(a)the-newzgroups.com says... > > I keep seeing these little solar power sidewalk lights. Last year > they were all white (blueish white). Lately I see them where they > change color. Yet, they only have one LED. How can a LED change > color? I thought the color was determined by dopeing it with a metal. > So how can they change? This has me puzzled. It could be the plastic windows on those cheap things turning yellow? -- If there is a no_junk in my address, please REMOVE it before replying! All junk mail senders will be prosecuted to the fullest extent of the law!! http://home.comcast.net/~andyross
From: Spamm Trappe on 7 May 2010 15:14 On Fri, 7 May 2010 17:29:19 +0000 (UTC), Meat Plow wrote: > > Well then I am uninformed on newer technology ... Says it all.
From: asdf on 8 May 2010 22:51
On Thu, 06 May 2010 01:20:36 -0500, mister_friendly wrote: > I keep seeing these little solar power sidewalk lights. Last year they > were all white (blueish white). Lately I see them where they change > color. Yet, they only have one LED. How can a LED change color? I > thought the color was determined by dopeing it with a metal. So how can > they change? This has me puzzled. They could be RGB leds. These devices, now very cheap on ebay, are externally identical to an ordinary two pin led though they contain three emitting diodes in the same package plus a small circuit that flashes each of them independently. http://www.youtube.com/watch?v=PPtg4mFC_-k |