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Old 31st Dec 2019, 11:15 pm   #1
ORAWA01
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Default Using lamp current limiter

Just made up a lamp current limiter. But could not buy 100W bulbs from anywhere.
All they have are LED bulbs 8.5W 10W and current they draw is about 90mA.

I plugged one of the LED bulb into the limiter, and plugged in a soldering iron of 30W.
The soldering iron got hot, but less hotter than usual.

And LED lamp of 8.5W never come on. Could you explain what is happening here? Thanks.
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Old 31st Dec 2019, 11:21 pm   #2
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Default Re: Using lamp current limiter

You've been here before recently:-

https://www.vintage-radio.net/forum/...1&postcount=24
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Old 31st Dec 2019, 11:22 pm   #3
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Default Re: Using lamp current limiter

You cannot use LED lamps in a conventional lamp limiter circuit.

The Lamp limiter relies on the fact that a cold lamp has a low resistance which increases as the lamp gets hotter.

LED lamps are constant power at best.

Look for Incandesent lamps or rough service lamps.

Cheers

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Old 31st Dec 2019, 11:26 pm   #4
ORAWA01
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Default Re: Using lamp current limiter

They said that they don't sell normal 100W bulbs anymore because it is not energy efficient. Max Wattage bulb they had was 40W.
I have been to 3x different local supermarkets looking for the 100W normal bulbs.
I shall just have to get 40W bulbs, and change the LCL to take 2x separate bulbs of 40W each.

Ahh... mail order? Maybe that's where I must look into. Thanks for the link.
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Old 31st Dec 2019, 11:29 pm   #5
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Default Re: Using lamp current limiter

You won't get rough service lamps from a supermarket or DIY outlet.

Try an electrical wholesaler or buy online.
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Old 31st Dec 2019, 11:33 pm   #6
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Default Re: Using lamp current limiter

It is no longer possible to legally sell 100W incandescent lamps for general use. You will need to look for professional 'rough service' lamps, or build a limiter using several lower wattage lamps in parallel. 40W 'fireglow' lamps are still available from Poundland.
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Old 31st Dec 2019, 11:33 pm   #7
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Default Re: Using lamp current limiter

My local Tesco's sell 100-watt B.C. halogens.

Al.
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Old 1st Jan 2020, 1:04 am   #8
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Default Re: Using lamp current limiter

If anyone wants a few 60W BC incandescents I have a crate of large globe bulbs here waiting for service as limiters.
Not sure how well they would survive in the post though
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Old 1st Jan 2020, 2:19 am   #9
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Default Re: Using lamp current limiter

https://www.tlc-direct.co.uk/Products/LSGLS100BCCL.html
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Old 1st Jan 2020, 10:28 am   #10
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Default Re: Using lamp current limiter

Two posts moved to this thread:-

https://www.vintage-radio.net/forum/...d.php?t=162155

I'll close this thread as there's nothing more to be said.
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