G4 - Halogen Bi-Pin
12V10W

The 12v10w halogen task light has become very popular in recent RVs. The puck-shaped fixture using this bulb fits into the ceiling or the underside of cabinets to illuminate counters and desktops.

This halogen bulb is available under different labels in different RV parts stores. You can also find halogen bulbs rated for 15W and 20W usage.

LightBlasters groups its lamp replacements for these halogen bulbs under the heading G4, the name for the base, meaning it is a bi-pin bulb with 4 mm spacing on the pins.

Operating specifications for the standard 12 volt G4 bulbs are

 

 12V10W/G4

   12V15W/G4

  12V20W/G4

volts

12.0

12.0

12.0

amps

0.83

1.25

1.67

watts

10.0

15.0

20.0

candela (cp)

9.5

12

32

inital lumens

120

150

200

lifetime (hrs)

2,000

2,000

2,000

replace with

G4.RV2H
G4.RV3H

G4.RV3H

G4.RV3H

Halogen bulbs will maintain most of their initial luminosity over their lifetime so long as they are properly used. They provide a near 100% color rendering. However, the surface temperature of halogen bulbs reaches 1,000 degrees Fahrenheit or more. The gas inside is under pressure and can explode if used improperly.

When replacing inspecting halogen bulbs, be sure you do not touch the surface of the bulb with your bare skin. That can leave skin oils on the bulb that will greatly reduce its lifetime and may even cause the glass to shatter.

If a halogen bulb is cycled often without fully warming, or if it is used with a dimmer, or if it is in a cooling draft, it may "brown" as the filament evaporates and is deposited on the glass.

WARNING: DO NOT replace a 10 watt halogen bulb with a 15 or 20 watt bulb unless the fixture is rated for it. It will fit, but the added heat can destroy the fixture and possibly even start a fire in your RV coach. Any sign of cracking or melting of the fixture or browning of the panel around the fixture is an indication of excessive heat. You might want to remove the fixture and check its rating on the back. People have been sold rigs with the incorrect bulbs already in the fixtures.

See donsbulbs.com for detailed specifications for 12v10w bulbs. Check out Halogen Bulbs for a description of how these bulbs work.