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Mine Exploration Forum

Author Cap lamp bulbs
wheldale

Joined: 03/10/2008
Location: Brighouse, West Yorkshire

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Cap lamp bulbs
Posted: 12/12/2014 15:08:03
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Has anyone replaced a halogen bulb in a Oldham cap lamp with a Maglite LED bulb? Just spotted this on Ebay
http://www.ebay.co.uk/itm/TTS-1-Watt-Cree-XP-G2-LED-Bulb-2-to-9v-upgrade-for-Maglite-torches-many-others-/281335978220?pt=UK_SportsLeisure_Camping_LightsLanternsTorches&hash=item4180ee58ec

Just wondered if this would work ok or would produce too much heat in the lamp??

Thanks all!
IP: 81.148.131.216
rufenig

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Joined: 18/03/2008
Location: Shropshire Hills

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Posted: 12/12/2014 15:51:04
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S.M.T. replaced 22 traditional bulbs in Speliotechnics lamps with LED replacements from him.

They have been VERY reliable and well worth the money.
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IP: 87.112.40.137 Edited: 12/12/2014 15:53:06 by rufenig
Roger L

Joined: 01/06/2010
Location: Huddersfield

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Posted: 12/12/2014 16:39:18
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Thanks for the info. Will try them out

--

Mine Lectures & Walks available for around Huddersfield
IP: 213.104.65.129
jagman

Joined: 11/03/2007

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Posted: 12/12/2014 18:03:18
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I'm fairly sure they won't work
If I remember rightly the polarity on an Oldham bulb is the opposite to the Maglite.

I think the case of the Oldham bulb is the live with the base being the negative.
I stand to be corrected however
IP: 5.69.170.143
Morlock

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Joined: 31/07/2008

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Posted: 12/12/2014 18:16:47
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jagman wrote:

I'm fairly sure they won't work
If I remember rightly the polarity on an Oldham bulb is the opposite to the Maglite.

I think the case of the Oldham bulb is the live with the base being the negative.
I stand to be corrected however


IIRC I had that issue with the R2 led conversions and got round it by swapping the leads in the headpiece and possibly the same with the charger, I think!

Edit: I've now moved on to 18650 pack in Oldham case so Oldham set up is a bit vague.
IP: 81.129.22.15 Edited: 12/12/2014 18:20:19 by Morlock
royfellows

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Joined: 13/06/2007
Location: Great Wyrley near Walsall

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Posted: 12/12/2014 18:17:52
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The Oldham is negative switching through the spring contacts so Jagman is correct, bulb case is +V and base is -V

It should however be a simple task to change over the terminals provided that through the headset charging is not required.

--

The expert in anything is really the true beginner, by becoming an expert so the knowledge for self advancement is acquired.
IP: 88.105.216.143
Mr.C

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Joined: 23/03/2008
Location: North Staffordshire

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Posted: 12/12/2014 18:19:22
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jagman wrote:

I'm fairly sure they won't work
If I remember rightly the polarity on an Oldham bulb is the opposite to the Maglite.

I think the case of the Oldham bulb is the live with the base being the negative.
I stand to be corrected however

Dead right, you will have to reverse the head piece & charger polarity.
Hope you're keeping well Jagman!
Not seen you for ages.

--

We inhabit an island made of coal, surrounded by fish. How can we go wrong.......
IP: 95.145.205.245
jagman

Joined: 11/03/2007

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Posted: 12/12/2014 18:35:46
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Mr.C wrote:

jagman wrote:

I'm fairly sure they won't work
If I remember rightly the polarity on an Oldham bulb is the opposite to the Maglite.

I think the case of the Oldham bulb is the live with the base being the negative.
I stand to be corrected however

Dead right, you will have to reverse the head piece & charger polarity.
Hope you're keeping well Jagman!
Not seen you for ages.


Not bad ta MrC
Don't do an awful lot other than work at the moment

You keeping well?

IP: 5.69.170.143
rufenig

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Joined: 18/03/2008
Location: Shropshire Hills

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Cap lamp bulbs
Posted: 12/12/2014 18:41:07
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When I did the SMT lamps I had to change-over the wires in the headshells.
This is ok because the batteries plug into the charger separatly.

IP: 87.112.40.137
wheldale

Joined: 03/10/2008
Location: Brighouse, West Yorkshire

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Posted: 12/12/2014 19:28:19
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On the link to the eBay page it says the bulb is "non polarity" so wiring should not be an issue, I'm no expert here so have I missed something regarding reversing wires etc? IP: 90.203.60.77
Mr.C

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Joined: 23/03/2008
Location: North Staffordshire

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Cap lamp bulbs
Posted: 12/12/2014 19:36:32
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wheldale wrote:

On the link to the eBay page it says the bulb is "non polarity" so wiring should not be an issue, I'm no expert here so have I missed something regarding reversing wires etc?

I suppose it could have a bridge rectifier in the the lamp body, that would make it "non polarity" but you would loose 1.2V.
Shouldn't be an issue though with a single LED & 4.5V of battery to play with.

--

We inhabit an island made of coal, surrounded by fish. How can we go wrong.......
IP: 95.145.205.245 Edited: 12/12/2014 20:05:21 by Mr.C
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