Light problem?

This is the place for Technical Tips, Questions and Answers.

Postby lesclarke » 17 Jan 2008, 19:14

Just received some LED bulbs that replace dichroic (?) 12v halogen bulbs.

Before Xmas they were 'out of stock'. They are described as equivalent to a 20-30watt bulb as far as light output, but only use 1-1.5watt of power, so a 12v power supply would last many times longer. Another advantage for use in or around a booth is that they do not get hot.

They fit an MR16 type fitting, and are often used in spotlight systems for the home with a mains/12v transformer.

I got them for possible future use, as a 2 light system for dull or dark conditions, from www.reuk.co.uk

The link below shows bulbs and bulb holder.

http://www.reuk.co.uk/buy-12V-LED-SPOTLIGHT-BULB.htm

Whilst the above bulbs were out of stock I did manange to find some that would be even better, in that they had a warmer type of light and threw a wider beam, but against a cost of £4.49 each above, these were £20-£25 each. Though they look very well made with metal bodies, and all these bulbs are supposed to have very long lives, quoted often as 50-100,000 hours.
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Postby lesclarke » 31 Jan 2008, 00:07

I have done a test on the above LED MR16 fitting spotlight bulbs. They 'do what it says on the tin' in that they use a fraction of the power of the halogen ones they replace and they run with hardly a sign of producing any heat at all.

Equivalent in brightness to a 20 watt halogen, using under 2 watts one lasted for 18 hours supplied by a very small (1.2Ah Sealed-lead-acid battery, ) which measures 4"x2"x2", and weighs one and a quarter pounds.) So, even using a set up with 2 or 3 of them the battery size needed is minimal, or there would be little drain on anyones existing 12v power supply.

I'm now working on a simple way of getting just the right amount of light in just the right place.
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Postby lesclarke » 01 Feb 2008, 15:27

Rather than watching paint dry I have been 'busy' watching light bulbs (LED) to see how long batteries last. I remembered that on a pic of Geoff Felix's mini amp set up it looked like he was using AA batteries to power it.

I knew battery holderS were available for 8 x .15v AA batteries and had seen them on the site where I bought the 20watt equiv LED spot, so I sent for some.

So,in case it is any use to anyone at any time... 8x1.5v batteries, (=12v supply) not expensive ones, but 'Poundshop' quality at 12 for £1, have so far lasted 9 hours. The output does reduce with time, but still useful.
After 9 hours they will still power my small 12watt output amp I use, so may find a place as a back-up pack. It would be fiddly to keep taking it apart, but from memory there may even be enough space inside the amp to fit the batteries in.
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Postby James » 02 Feb 2008, 19:41

lesclarke wrote:Rather than watching paint dry I have been 'busy' watching light bulbs (LED) to see how long batteries last.


'Small pleasures, small pleasures, who would deny us these'

Never let it be said that they don't know how to have a good time in Yorkshire!
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Postby lesclarke » 02 Feb 2008, 23:07

Well, it's a bit quiet at this time of year, but 'Moonraking' approaches.


http://www.slaithwaitemoonraking.org/
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Postby David Wilde » 02 Feb 2008, 23:13

Will Roger moore be there Les?
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Postby James » 02 Feb 2008, 23:18

And can Shirley Bassey swazzle?
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Postby David Wilde » 02 Feb 2008, 23:20

YES! she has got a book on how to do it!
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Postby lesclarke » 02 Feb 2008, 23:21

Very witty Mr Wilde.
It's a primitive ritual, dating as far back as the 1980s I think.
As a sophisticated Lancashire Lad I find it fascinating, though it's always a
bit of a Brass Monkey night.

I'll be giving my AA battery operated LED mini Christmas lights an outing.
Off to watch the boxing!
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Postby James » 02 Feb 2008, 23:25

My life with Punch, by Joe Blofeld, edited by Sir Geoff Drax?
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Postby David Wilde » 02 Feb 2008, 23:27

You know Jaws is going to crush your booth at the mayfayre if you carry on James!
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Postby James » 02 Feb 2008, 23:30

'Carry on James'...don't think I've seen that one.
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Postby David Wilde » 02 Feb 2008, 23:36

You and Frankie Howard was it James, OO NO MISSIS! put those puppets away!
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Postby James » 02 Feb 2008, 23:40

I never watch my own work...far easier that way. Though (contrary to popular belief) I wouldn't go so far as to do the show with my eyes closed!
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Postby lesclarke » 02 Feb 2008, 23:49

"The best way is to do it with a closed mind, then at least the rubbish you produce is your very own rubbish." - DISCUSS.

But don't expect me to waste my time on it, as I said I'm off to watch the boxing.

"Is there boxing on?"
"Yes, two great idiots thumping the life out of each other!"

Come on then at least one of you MUST be able to give me the origin of these two lines.
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