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Light bulb socket & base explained
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Both G4 and GU4 lamps are low-voltage light sources. The GU lamps are generally fitted with a reflector with an 11/8 inch diameter, labelled MR11.
Attention: G4 and GU4 are often confused, but are not identical. Although both have a pin spacing of 4 mm, the diameter of the pins is slightly larger for GU4 with Ø 0.95 to 1.05 mm than for G4 with Ø 0.65 to 0.75 mm.
:format(jpeg) "Halogen pin base lamp Halostar Starlite from OSRAM")
G4 lamp without reflector.
:format(jpeg) "GU4 MR11 LV reflector lamp DECOSTAR 35 STANDARD from OSRAM")
GU4 MR11 lamp with reflector
G4 / GU4 MR11 light sources are very small and compact. They are most frequently used for recessed furniture lights, under-cabinet lights or extractor bonnets, for example. Some designers have also opted for these light sources. The Telchisugiò from Catellani & Smith, for example, lights up with a GU4 MR11 lamp, while the Drop from Alma Light Barcelona has G4 sockets.
:format(jpeg) "Paulmann Micro Line recessed ceiling spotlight")
The typical application for G4 / GU4 MR11 light sources is recessed furniture lighting.
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A total of 37 G4 light sources illuminate the Drop pendant light by Cristian Cubiñá.
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The aluminium body of the Telchisugiò in a gold leaf look is illuminated with GU4 MR11.
:format(jpeg) "GU4 MR11 socket")
Detailed image of the GU4 MR11 reflector of the Telchisugiò.
G4 / GU4 LED lamps are compatible with all conventional G4/GU4 sockets with regard to the base. However, the LED version offers some improvements:
The switch is particularly worthwhile if, for example, several recessed luminaires in the hallway or living room were previously operated with G4/GU4 halogen lamps. LED can save a lot of money on operating costs.
:format(jpeg) "Glass ceiling light")
The difference between the light sources lies in the pin spacing (GU5.3 pins have a spacing of 5.33 mm) and usually also in the reflector size, indicated by the following MR.
Both light sources are low-voltage light sources, but GU5.3 lamps are used more in spotlights and spotlights, e.g. also in the form of surface-mounted ceiling lights.
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Modern G4 LED light source.
:format(jpeg) "GU4 MR11 LED reflector")
Modern GU4 MR11 LED reflector _
The strike-through prices correspond to the manufacturer's RRP.
All prices include 20% VAT, delivery costs excluded.
