Re: [bolger] Re: LED anchor light - update
The City of Fort Collins, CO upgraded to the LED bulbs. It's a city of 120 thousand and said it would cost about $200,000 to install the new bulbs but the pay back in energy savings would return it in 3 years. That was a year ago and I have to tell you, those suckers are bright! At night almost too bright! They can hurt you eyes, don't stare at them too long.
I think Rich has something going here, I must try these out!
Jeff
I think Rich has something going here, I must try these out!
Jeff
----- Original Message -----
From: paxton_consulting
To:bolger@yahoogroups.com
Sent: Saturday, January 19, 2002 2:57 PM
Subject: [bolger] Re: LED anchor light - update
The city recently installed some new stoplights, and I noticed that
they aren't like the old ones which had a colored lens
(red/amber/green) with a light behind it. The new ones have no lens,
and are made up of many small, very bright bulbs. After reading your
posts, my bet would be that they are LEDs.
Bill Paxton
--- In bolger@y..., "rlspell2000" <richard@s...> wrote:
> Burned out 3 LED's before I realized they work better on the BOTTOM
> of the voltage range. Now have 16 hooked up, two sets of 8(in
> parralel), hooked up in series
>
> Using a 7805, a 500 ohm trim pot, and a 1k resistor to get a
> regulated voltage of 7.2. To hit the bottom of the 3.6-4v range of
> the LED's.
>
> I have the 16 hooked up, and all together they are drawing .3 amps.
>
> They are blindingly bright too. I have a row of 16 spots behind my
> eyes right now... <grin>
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[Non-text portions of this message have been removed]
yes. 8 in series would take a driving voltage of 28.8. Also, if I had
two strings of eight, and one went out, I would loose half the light.
If I have 8 strings of 2, and one goes out, I loose 1/8th of the
light.
There will be solar cells to charge and maintain the batteries on the
boat, which will run the lights, along with other things. There will
be no solar cells dedicated specificaly to the lights.
two strings of eight, and one went out, I would loose half the light.
If I have 8 strings of 2, and one goes out, I loose 1/8th of the
light.
There will be solar cells to charge and maintain the batteries on the
boat, which will run the lights, along with other things. There will
be no solar cells dedicated specificaly to the lights.
--- In bolger@y..., "petehodges" <petehodges@y...> wrote:
>
> > I have the 16 hooked up, and all together they are drawing .3
amps.
>
> Just out of curiousity, is there a reason you did not go with two
> series string of 8 lights and then put the two stings in parallel.
>
> I was thinking abour redundancy. I was also thinking about those
old
> series Christmas lights and what a pain it was when one went out.
>
> Do you have any intention of adding solar cells to the light and a
> battery. The same concept they have athttp://www.carmanah.com/?
> source=overture
>
> Good work.
> I have the 16 hooked up, and all together they are drawing .3 amps.Just out of curiousity, is there a reason you did not go with two
series string of 8 lights and then put the two stings in parallel.
I was thinking abour redundancy. I was also thinking about those old
series Christmas lights and what a pain it was when one went out.
Do you have any intention of adding solar cells to the light and a
battery. The same concept they have athttp://www.carmanah.com/?
source=overture
Good work.
The city recently installed some new stoplights, and I noticed that
they aren't like the old ones which had a colored lens
(red/amber/green) with a light behind it. The new ones have no lens,
and are made up of many small, very bright bulbs. After reading your
posts, my bet would be that they are LEDs.
Bill Paxton
they aren't like the old ones which had a colored lens
(red/amber/green) with a light behind it. The new ones have no lens,
and are made up of many small, very bright bulbs. After reading your
posts, my bet would be that they are LEDs.
Bill Paxton
--- In bolger@y..., "rlspell2000" <richard@s...> wrote:
> Burned out 3 LED's before I realized they work better on the BOTTOM
> of the voltage range. Now have 16 hooked up, two sets of 8(in
> parralel), hooked up in series
>
> Using a 7805, a 500 ohm trim pot, and a 1k resistor to get a
> regulated voltage of 7.2. To hit the bottom of the 3.6-4v range of
> the LED's.
>
> I have the 16 hooked up, and all together they are drawing .3 amps.
>
> They are blindingly bright too. I have a row of 16 spots behind my
> eyes right now... <grin>
Burned out 3 LED's before I realized they work better on the BOTTOM
of the voltage range. Now have 16 hooked up, two sets of 8(in
parralel), hooked up in series
Using a 7805, a 500 ohm trim pot, and a 1k resistor to get a
regulated voltage of 7.2. To hit the bottom of the 3.6-4v range of
the LED's.
I have the 16 hooked up, and all together they are drawing .3 amps.
They are blindingly bright too. I have a row of 16 spots behind my
eyes right now... <grin>
of the voltage range. Now have 16 hooked up, two sets of 8(in
parralel), hooked up in series
Using a 7805, a 500 ohm trim pot, and a 1k resistor to get a
regulated voltage of 7.2. To hit the bottom of the 3.6-4v range of
the LED's.
I have the 16 hooked up, and all together they are drawing .3 amps.
They are blindingly bright too. I have a row of 16 spots behind my
eyes right now... <grin>