Subject:
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Re: lights
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Newsgroups:
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lugnet.general
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Date:
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Tue, 6 Apr 1999 17:33:49 GMT
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Viewed:
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1180 times
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In lugnet.general, James Beerman writes:
> I'm trying to install lights into my town, but I don't want to buy
> the ones tlg sells. Does anyone know of the best alternative?
> I could buy LEDs for a low price, but I think they won't be bright enough.
>
> Jimmy
Hi,
LED will do, use the "1 3/4" size the fit great into technic beams.
Brightness depend on the current you allow the flow throw the led. In general
10 mA will work just fine. Current formula is C = T/R where T is the voltage
and R the resistor that you put in serie with. The led will drop about 2V
(between 1.8 - 2.2 depend on the colors).
R led
---/\/\/---|>---
7V 2V
so take 7V devide it by .01A and the result is 700 ohm
700ohm are NOT standard value, so you could take a 680 or a 720 ohm resistor.
There also a guy who wrote about using "radio shack" 12V light some time ago
and they where working fine
Martin
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Message has 1 Reply:
 | | Re: lights
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| (...) <snipped math> (...) I have used 9V lighting. The math given sounds good. Adhere to it. If you're not math oriented like me, I've found that if you use 5 ordinary LEDs connected in series with each other using 9VDC they work fine. If you use (...) (25 years ago, 6-Apr-99, to lugnet.general)
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Message is in Reply To:
| | lights
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| I'm trying to install lights into my town, but I don't want to buy the ones tlg sells. Does anyone know of the best alternative? I could buy LEDs for a low price, but I think they won't be bright enough. Jimmy (25 years ago, 5-Apr-99, to lugnet.general)
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