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Old 7th August 2002, 08:00 AM   #1
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Lightbulb blue led at night

Hi,

I think everyone who uses those newer blue leds has experienced the nice colour during the day and the somewhat high intensity at night.

Wouldnīt it be nice if it (the led) would change itīs intensity according to the available light?

Does anybody have an idea how this could be done (LDR etc.) in a simple way?

William
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Old 7th August 2002, 09:57 AM   #2
SHiFTY is offline SHiFTY  New Zealand
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Those blue leds are very directional... just angle it so it is not shining at you and you should be ok... Otherwise a LDR might work but there is the hassle factor.

I like my blue LED!!!
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Old 7th August 2002, 10:09 AM   #3
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shifty,

I asked this question to avoid the hassle incase somebody allready has done something like this

Changing the direction wonīt help a lot cause the whole room in kind of blue right now!

william
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Old 7th August 2002, 10:45 AM   #4
Jason is offline Jason  Australia
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I have the same problem.

I use a bit of blutac to cover it up, or combine with some paper to dim.

Blutac gets pretty runny after a while of sitting on a on a big class A.
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Old 7th August 2002, 04:55 PM   #5
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You could drive the LED with a current source that uses a photocell to vary the drive to the LED. In bright light it can be made to shine brightly and in darkness, it can be made dim. You'll have to put the photocell somewhere that it can see the room light level (front panel?).

Lots of el cheapo night lights do this...

MR
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Old 7th August 2002, 05:04 PM   #6
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An old TV of mine would do the same thing that you mentioned. It worked like a charm. I don't know why TVs stopped using that feature.
-Dan
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Old 7th August 2002, 06:04 PM   #7
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thank you all,

for the replies, they confirm what I already figured out but what I would really like is an answer like:

"buy this ldr, use a bc547 a 30VA trannie and 1k, connect them like this and it will work "

This thread was opened because I really donīt have time at the moment (or because Iīm too lazy) to fiddle around with different types of ldrīs and do a lot of experimenting

william
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Old 7th August 2002, 07:02 PM   #8
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Quote:
Originally posted by wuffwaff


"buy this ldr, use a bc547 a 30VA trannie and 1k, connect them like this and it will work "


How about a switch to turn them off for a night? Simple and practical solution.
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Old 7th August 2002, 07:21 PM   #9
tiroth is offline tiroth  United States
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Or a dimmer switch with a larger series resistor.
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Old 9th August 2002, 03:57 PM   #10
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Hey,

I got ... use to it. Living in city all my life, I can sleep in day light and have REM sleep. ... hehe.

I face LED inward and use indirect illumination. Use like white strip of paper or tape.

You can cut off the top of LED and sand it real well. Make that translucent. I think it would look more professional. BLED is a tad too bright anyways.

Tomo
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