RE: LED lighting for garden

["Keith Doxey" <ukha.diyha@xxxxxxx>]

Rapid Electronics 01206 751166

Quite good on prices especially for quantity.

Blue and White will be expensive anywhere.

They also do some Multicolour which have 6 leads and contain 1 Red, 1 Green
and 2 Blue LEDs. With those and some clever wiring you can achieve ANY
colour you want.

Keith

-----Original Message-----
From: Ian Oliver [mailto:ioliver.lists@xxxxxxx]
Sent: 20 April 2001 10:27
To: ukha_d@xxxxxxx
Subject: Re: [ukha_d] LED lighting for garden


> I didnt fully read the earlier posts regarding the intended use, but I
> assume this is just for a decorative effect rather than illumination.
These
> LED's are extremely bright but have a VERY narrow viewing angle, some
less
> than 20 degrees.

Yes, decorative, so we want to throw beams onto and into trees.

> With LED's you MUST have a resistor to limit the maximum current
throught
> them to a safe value. Taking the White LED's on the page you mention,
> Forward voltage @ 20mA is 3.6V so placing several in series would add
up
as
> follows 3.6, 7.2, 10.8 (limit for a 12v supply) 14.4, 18v, 21.6 (limit
for
> 24V supply). 3 LEDs on 12V needs a 60 ohm resistor to drop the excess
1.2V
> nearest standard value is 62R. 6 LED's on 24V needs a 120 ohm resistor
> (standard value)
> Power rating should be 0.6W Metal Film Resistor

Thanks for that.  I'll get some LEDs and experiment. Anyone know a good
source in the
UK?  I've checked Farnell but they seem quite expensive. OK, for a few to
experiment,
but no good for doing the job for real.

Regards

Ian Oliver

Using Java on Tini for control via Dallas 1-wire






Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/