On Oct 20, 6:37*pm, T i m wrote:
On 20 Oct 2008 14:48:16 GMT, pete wrote:



If you fancy playing around with some LEDs, try these kinda things:
http://tinyurl.com/5psh64
Briefly, high-power LEDs are extremely bright. These units claim up to
400 lumems (c.f. 100W bulb: 1700 lumens) and can be wired in series
to match the voltage from your battery - more or less.

Understood.

The one's I got a couple of years ago were 1W jobs, they came with a
warning not to look directly at the light source. Although not as
bright as a mains bulb, the source is much, much smaller so the light
is more concentrated.

Yes, I have a single_LED torch and it is very intense indeed!

If it's agreed that LED's are the most efficient I'm thinking I could
wire a few of those little 'stick-up' lights (that normally take 3 x
AAA or similar) together in series parallel (if *each unit is designed
to run on 3 x 1.5V (4.5V) then 3 in series should be ok on ~14V ?

I've seen said pretty cheap on the markets and I think are often also
magnetic (so would clip directly to my steel roof angles). ;-)

http://www.amazon.co.uk/LED-Stick-N-.../dp/B000NOSCYO

I'd be surprised if those were the most efficient LEDs around. More
likely cheap sh--.


NT