G4 & GY6.3 Halogen Plug-in Bulbs

GY6.35 or G4 plug-in bulb?

The main difference between a GY6.35 and G4 halogen plug-in bulb is the distance between the pins.

• G4 plug-in bulbs have two pins that are 4 mm apart. You often find them in smaller fixtures, such as under-cabinet lighting and decorative lighting.
• GY6.35 plug-in bulbs also have two pins, but they are 6.35 mm apart. This type of plug-in bulb is often used in larger fixtures.

Both bulbs are low-voltage halogen bulbs, or 12-volt bulbs. Although they are similar in appearance, you cannot interchange G4 and GY6.35 plug lamps because of the difference in pin spacing. Look on your old bulb or fixture to see which socket you need. Then immediately check the maximum wattage. This is because certain fixtures work with a maximum wattage.

Difference between G4 and G9 bulbs

We understand that G4 and G9 bulbs sometimes cause confusion, they are quite similar. Note the fitting: a G4 has two straight pins, and a G9 has 2 (or 2x2) curved pins. You can also measure the distance between the pins. On a G4 it is 4mm, while on a G9 it is 9mm. Take a good look at the picture below. Above you can see a G4 fitting and below a G9 fitting.

G4 fitting

G9 fitting

Does your old bulb have bent pins? Then take a look at our range of G9 halogen plug-in bulbs.

Halogen GY6.35 and G4 dimmable

All our GY6.35 and G4 halogen plug-in bulbs are dimmable. So if you want a brighter bulb that's no problem. For softer light you can then always dim the bulb. In addition, we have both G4 halogen and GY6.35 with clear glass or frosted glass. With the latter version you have less trouble with bright direct light.

LED bulbs

• G4 LED
• G9 LED
• GY6.35 LED
• All led bulbs

Halogen down lights

• GU4 halogen downlights 25 mm
• GU4 downlights halogen 35 mm
• GU5.3 halogen downlights 50 mm
• All halogen bulbs

Advice

• Replace halogen with LED
• All about the wattage of bulbs