Integral compact fluorescent lamp

When incandescent lamp manufacturers want to make lamps with different ratings, 40 watt and 60 watt lamps for example, they simply alter the length of the coiled tungsten filament. Since the filament is rather small in either case, there's little apparent difference in the two lamps. Compact fluorescent lamps (CFLs) are different.
This lamp is a demonstration triple-tube compact fluorescent lamp made by Philips about 1995. One way to increase the light output from CFLs is to make the tube longer. In this lamp the three tubes are connected by thin glass passages called bridge-welds, creating a continuous path for the electric current to travel. Using bridge-welds allowed the engineers to place the three tubes very close together, reducing the size of the lamp as a whole. The plastic base-skirt that houses the control electronics is clear so that whoever is demonstrating the lamp can show the electronic circuitry.
Lamp characteristics: Nickle-plated, medium-screw base with clear plastic skirt that houses an electronic ballast and a starter. Three fluorescent tubes are connected by bridge-welds. Included are two electrodes, mercury, and a phosphor coating. No external cover is placed over the tubes. Lamp was operational when donated.
Object Name
fluorescent lamp
discharge lamp
Date made
ca 1995
date made
ca. 1995
Philips Lighting Company
Physical Description
plastic (overall material)
glass (overall material)
mercury (overall material)
metal (overall material)
overall: 5 1/2 in x 2 1/8 in x 2 1/8 in; 13.97 cm x 5.3975 cm x 5.3975 cm
ID Number
catalog number
accession number
Energy & Power
See more items in
Work and Industry: Electricity
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
from Philips Lighting Co.
Publication title
Lighting A Revolution
Publication URL

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