Thanks for that David. I've been so involved in other wiring projects,
haven't read this thread yet.

Thats a sizeable cap! Image showing measurements:

http://tinyurl.com/ybxpvnx5

I did see your comment on semiconductors being used for this type of circuit.

On 8/2/17, David Beierl <dbeierl@attglobal.net> wrote:

> Osram DE3423 LED festoon lamp is one watt.  If you want ten seconds of
> fading light at average half brightness that would require something like
> five watt seconds of storage in your capacitor.  Say six or seven because
> of the threshold voltage of the LED.  WS = C x V^2 / 2, so C = WS / (V^2 /
> 2).  So C = 7 ws / (12V^2 / 2) = 7 / 72 = ~0.1 farad or 100,000 uF.
>
> Here's one that would serve.  It's nominal 40 mm diameter and 80 mm length,
> and it costs ten bucks US in onesies.
> https://www.digikey.com/product-detail/en/united-chemi-con/ESMH160VSN104MA80T/565-2624-ND/757837
>
> Yrs,
> d
>
>
>
> On Wed, Aug 2, 2017 at 1:32 PM, Neil N <musomuso@gmail.com> wrote:
>
>> Thats great! So about 5 seconds eh? I'd think that for a festoon the
>> cap(s) would have to be much bigger. But maybe 3 of those small LED's
>> would be plenty?
>>
>

--
Neil n

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