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blue ultrabrights

blue ultrabrights

2006-02-26 by keith sterling

>
> I've got some nice blue ultrabright LEDs,

Not to spoil your fun, but I used blue super bright LEDS on a
project.... and hated the look. Unlike the other ultra brights I
used, (white, purple, green) the blue ones always distracted me, even
from across the room. Plus they were so blinding that I could not
read the front panel. I switched them to normal diffused blue leds and
everything is better.

Keith

Re: blue ultrabrights

2006-02-26 by Andre Majorel

On 2006-02-25 18:59 -0800, keith sterling wrote:
Show quoted textHide quoted text
> > I've got some nice blue ultrabright LEDs,
>
> Not to spoil your fun, but I used blue super bright LEDS on a
> project.... and hated the look. Unlike the other ultra brights I
> used, (white, purple, green) the blue ones always distracted me, even
> from across the room. Plus they were so blinding that I could not
> read the front panel. I switched them to normal diffused blue leds and
> everything is better.

Where I work, one of the KVMs had a bright blue led. It sat
about 2.5 m from me, on the side (so it was in my peripheral
vision). It was so annoying I had to mask it with a piece of
tape.

--
André Majorel <URL:http://www.teaser.fr/~amajorel/>
Do not use this account for regular correspondence.
See the URL above for contact information.

Re: blue ultrabrights

2006-02-26 by sasami@hotkey.net.au

Last time I used a superbright blue LED, I wired 22k or 33k in series with
it to make it more appropriate. That's right 22 or 33 thousand ohms. The
good thing in this is it won't be spiking the PSU when it switches on and off.

Ken
Show quoted textHide quoted text
>On 2006-02-25 18:59 -0800, keith sterling wrote:
>
>> > I've got some nice blue ultrabright LEDs,
>>
>> Not to spoil your fun, but I used blue super bright LEDS on a
>> project.... and hated the look. Unlike the other ultra brights I
>> used, (white, purple, green) the blue ones always distracted me, even
>> from across the room. Plus they were so blinding that I could not
>> read the front panel. I switched them to normal diffused blue leds and
>> everything is better.
>
>Where I work, one of the KVMs had a bright blue led. It sat
>about 2.5 m from me, on the side (so it was in my peripheral
>vision). It was so annoying I had to mask it with a piece of
>tape.
>
>--
>André Majorel <URL:http://www.teaser.fr/~amajorel/>
>Do not use this account for regular correspondence.
>See the URL above for contact information.
>
>
>The CGS Modular Synth home page: http://www.cgs.synth.net/
>
>Yahoo! Groups Links
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_______________________________________________________________________
Ken Stone sasami@... or sasami@...
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>

Re: blue ultrabrights

2006-02-26 by c10h14no2i

I totally agree about those blue led's! I used to DJ at a club here,
and they got a new DJ mixer w/ a bright blue led on it. It was
horrible! In a totally dark club, its hard enough to see the tracks
on the records, but then after staring at a bright blue LED, it was
nearly impossible. I had to remember to bring some black electrical
tape w/ me every time I spun there.

Re: blue ultrabrights

2006-02-26 by Dave Kendall

Thanks for the replies guys.

Seems pretty clear what the consensus is......

Would it be a solution to *seriously* limit the voltage to them, making them
much dimmer?
Might that also have the benefit of drawing less current?

cheers,

Dave

Re: blue ultrabrights

2006-02-26 by Gerald Stevens

The backlash against blue LED's is pretty wide-spread. They're slick
looking and scream "modern", since they've only been available for a few
years, so manufacturers put them in everything these days. Keep them dim,
and they're not too painful to look at - my Virus Indigo has never bothered
me, and it has over 50 of them. Of course, they're diffuse and relatively
dim.

Here is a good summary of the very real reasons that people find blue LED's
irritating:

http://www.codinghorror.com/blog/archives/000337.html

-gerald
Show quoted textHide quoted text
On 2/26/06, Dave Kendall <davekendall@...> wrote:
>
> Thanks for the replies guys.
>
> Seems pretty clear what the consensus is......
>
> Would it be a solution to *seriously* limit the voltage to them, making
> them
> much dimmer?
> Might that also have the benefit of drawing less current?
>
> cheers,
>
> Dave
>
>
>
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Re: blue ultrabrights

2006-02-26 by peng3002

--- In cgs_synth@yahoogroups.com, Dave Kendall <davekendall@...>
wrote:
Show quoted textHide quoted text
> Would it be a solution to *seriously* limit the voltage to them,
making them
> much dimmer?
> Might that also have the benefit of drawing less current?
>
> cheers,
>
> Dave
>


Yes. I think so. I use blue and other ultrabright LEDs. I leave the
standard current limiting resister and connect a 50K trimmer in
series. Power up the circuit and trim the LED to the brightness you
like. Measure the trimmer resistance. Swap the trimmer and resistor
combo with a single resistor equalling their value.
With some circuits this may effect the output voltage. If so, use a
seperate LED driving circuit (transistor, resistor, and LED).


peng
http://home.comcast.net/~peng5002/mainpage.htm

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