Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
I was thinking about making a little battery powered strobe using one
of the really bright white LEDs now available. But I don't know how
long the phosphor glows after the LED turns off. Anybody here know?
Thanks,
Eric
What phosphor? LED is a semiconductor which produces light while active.
The ones from the stop light (missed the subject change when reading).On Sat, 20 Oct 2012 10:34:25 +1000, krw@att.bizzzzzzzzzzzz
krw@att.bizzzzzzzzzzzz> wrote:
On Fri, 19 Oct 2012 19:51:48 -0400, "Michael A. Terrell"
mike.terrell@earthlink.net> wrote:
David Eather wrote:
On Sat, 20 Oct 2012 05:32:17 +1000, Sjouke Burry ?s@b? wrote:
? Daniel Pitts ?newsgroup.nospam@virtualinfinity.net? wrote in
? news:mvhgs.6562$7h4.4069@newsfe10.iad:
?
?? On 10/19/12 10:58 AM, etpm@whidbey.com wrote:
??? I was thinking about making a little battery powered strobe using
one
??? of the really bright white LEDs now available. But I don't know how
??? long the phosphor glows after the LED turns off. Anybody here know?
??? Thanks,
??? Eric
???
?? What phosphor? LED is a semiconductor which produces light while
? active.
??
??
? Yes, but no white light.
? For white light you have a blue or ultrviolet LED, and a phosphor
? to convert that to white light.
? Also there are leds made out of three chips, each supplying a primary
? color. Philips did quite some reseach/development in that.
? There is no monochrome white light.
? Regarding the strobing, the white leds are not very suitable for
that,
? the phosphor has a very large turn-off time.
? A green led would do quite well, producing a bright beam.
? I would modify a green laser pointer for your strobe.
Or he could use an RGB led which makes (apparent) white light and has
no
phosphors
Why?
So you can throw away (more than) 2/3s of the energy in the filters.
What filters?