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Change of microscope bulb from halogen to led

Posted by Frank R.

Location

Bella Vista NSW 2153, Australia

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Due date
Sunday, 3rd Sep 2017
Details
I have a halogen bulb microscope bulb which takes an osram halogen with hard to find replacement. Bulb sits on a 5 CM reflecting mirror. So front must be 5 CM connection will be the new one that you put on. I have put pics of how bulb sits and the current 2 pin system that needs to be changed.
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“Great advice along the way to getting the job done well”
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“Interesting task. I repaired the socket and supplied an original lamp with three alternative replacements and supplier details. The only concern was the smoke detector above me when soldering!”
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Stuart N.
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Airtasker take a 15% fee. There's time and travel to the parts suppliers and site. It's an expensive microscope so I'm not rushing at the repair to save a few bucks. My offer is reasonable with parts included in price.
1 year ago
Frank R.poster
Hi Stuart just one last thing for you to know. The current attachment is a G6 35 socket. Can this be changed through cutting and soldering to a GU 10 because those are so easy to find and halogen lamps of the variety currently used is virtually out of market. The other thing is I assume the "face" of the lamp will be same to fit into the socket of the reflecting mirror. If so I am happy with what you suggest. Let me know.
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Philips Halogen Fibre Optic Lamp Lamp Base GZ6.35
Lamp Application: Optical & Medial Projection

See my previous comment. GU 10 versions are 240 Volt and not compatible with your microscope.
Frank R.poster
Ok fine you are right. So you will change the socket but I will use the halogen lamp you are suggesting or are you suggesting an exact same size bulb in led. Don't worry about the gu10 but my issue was being unable to find g6 35 replacements

A higher K colour temp is fine and probably better.

When can you come over
When are you available ?
Hi Frank,

The GU 10 versions are all 240 Volts (as best I can tell). GU 10 is designed for mains voltage. Your photo shows your lamp as 12 Volts. If you can source a 12 Volt, 100 Watt Halogen with GU 10 in an MR 16 assembly (the 'face') then I can change the socket ('plate') to GU 10 for you.

Please confirm that you have a source of GU 10 style lamps compatible with your 12 Volt system.

A LED replacement would be a good readily available long term solution but matching the luminosity and colour temperature (2800K - 3000k) may not be something you want to do.
Frank, as you possibly already know there's direct LED replacements for your halogen light. Around $15. As for the differing pin configurations; the low voltage assembly uses the 2 straight pin insert, the 240V uses a standard bayonet cap fitting. My thought is that with a LED replacement, you might not need to change the LED light for a very long time (due to LED life) and considering the heat reduction from lower current flow, the impact on the 2 pin fitting is much reduced. Perhaps a spray with contact cleaner and a direct LED replacement will likely see you through 50,000 hours MTBF. Otherwise for $300 I'll change the plug and socket combo for you :) - kind regards, Stuart
Frank R.poster
The pin plate has basically crumbled and disintegrated. There are 2 cables that lead from the switch to the plate and my guess would be that the plate would have to replaced by "cutting the wire" and making a new plate/socket where a LED can sit of the same size head. Is that what you were suggesting?
The 240v stuff is usually a gu10 style but can be bayonet also.. you should be able to get away with a new gimble lead and an led low voltage globe. Happy to look but it's probably not worth 300
The LED version of your Halogen assembly has an identical form factor. It's an industry standard fitting.

If the 'plate' (actually an electrical socket), has disintegrated then a replacement costs $9 and has the wires attached for installation.

So Yes, 'cut the wires', then solder or otherwise attach new socket (aka plate), then plug in LED lamp fitting. Re-assemble and your good to go for 10 years or so.

Can do Friday afternoon or on the weekend if you are interested. Let me know if you want me to make an offer or if you want further clarification.
Frank R.poster
The pin socket needs changing as the bulb pins keep getting stuck in them and breaking off. The newer bulbs available nowadays seem to have different attachments.
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