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Single Contact Bayonet Bulbs, Available in 13 watts to 27 watts and LED
For single contact bayonet bulbs, most manufacturers use the standard bulb numbers, #1141 for the 18 watt, #1156 for the 22-24 watt, and #93 for the 13 watt. This number can usually (but not always) be found stamped on the metal part of the bulb. When replacing bulbs be sure the bulb you are replacing looks like the picture and use the following measurements to compare with your existing bulb: Overall Length of 1 3/4", Diameter of glass bulb is 1", and diameter of metal base is just under 5/8". The base made be made of stainless steel or brass, depending on the manufacturer, and are interchangeable.
Single contact bayonet bulbs are small incandescent bulbs measuring 1 3/4 inches in length with a bulb diameter of approximately 1 inch. The metal base measures just under 5/8 of an inch in diameter. They are called bayonet bulbs because of the way they mount into the socket, similar to how the old bayonets mounted to early rifles and muskets. To install a bayonet bulb you simply press it down into the spring loaded socket, metal end first, and rotated slightly clockwise until it stops, then release pressure and the bulb should be "locked" into place. If the bulb is loose in the socket or fails to lock in place, the socket may be damaged or defective and should be replaced. We carry replacement sockets for single contact bayonet bulbs, in our 12 volt outdoor lighting bulbs section.
Single contact bayonet bulbs are available as an incandescent bulb or as an LED retrofit bulb. The incandescent bulb, which was invented by Thomas Edison, has been in existence for more than 100 years. Incandescent bulbs consist of a metal filament stretched between two electrical contacts, and enclosed in a glass housing which contains a vacuum. When electricity is passed through the metal filament it heats up to the point that it emits light. Since there is no air present for combustion, the filament does not burn up. If the filament was not in a vacuum it would only last seconds before burning up and failing. Some incandescent bulbs contain a rare gas such as halogen or xenon instead of a vacuum. This causes the light to burn much brighter.
The LED version of the single contact bayonet lamp is simply and LED retrofit assembly installed on a bayonet style base. Sometimes the LED bulbs are contained within the same glass globe as the incandescent bulbs use, although not in a vacuum. Other times the LED is just an exposed assembly mounted on the bayonet style base. The LED version of this bulb usually contains many tiny LED light outputs arranged in a circular pattern and with some on top to emit light in a 360° circle, as well as up. LEDs are more costly then incandescent bulbs but they do have several advantages. LED lasts much longer than incandescent bulbs, typically 40,000 hours compared to 2,000 hours for a halogen bulb. LED also uses much less energy, up to 80% less than incandescent, and because it puts out more light with less wattage used can be installed with smaller, lower cost transformers.
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