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Who knows anything about bulbs (electrical type!)

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 Oceanrower 05 Jan 2021

Evening question for you lovely people.

I need to replace a few G4 halogen capsule bulbs but they seem to come in a range of M numbers. M91, M86, M32 and M11 all seem to come up but they look identical.

Any idea what the M number means? Google, for a change, hasn't helped (or I'm asking the wrong question!)

Many thanks.

 gravy 05 Jan 2021
In reply to Oceanrower:

I think the M number refers to the filament type/size /arrangement and capsule shape (and possibly material). For general purpose lighting uses this simply doesn't matter but for use in things like projectors it does. So if this is used for lighting you can ignore it  and just go for G4 (fitting) and wattage.

 marsbar 05 Jan 2021
In reply to Oceanrower:

You might need to be careful if you replace halogen with LED you may need a new transformer.  

 marsbar 05 Jan 2021
 marsbar 05 Jan 2021
In reply to Oceanrower:

Is it G4 or GU 4

GU4 is the same fitting as M11 

 Oceanrower 05 Jan 2021
In reply to marsbar and gravy:

Definitely G4. You're right. It probably doesn't matter that much.

The trouble is that I hate not knowing something once I know that I don't know...

In reply to Oceanrower:

Don't worry about the known unknowns. It's the unknown unknowns that will get you.


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