Fluorescent lamp

Posted on Feb 4, 2014

Typical F71T12 100 W bi-pin lamp used in tanning beds. Note the (Hg) symbol indicating it contains mercury. In the US this symbol is now required on all fluorescent lamps that contain mercury. [1] Inside the lamp end of a preheat bi-pin lamp. In this lamp the filament is surrounded by an oblong metal cathode shield, which helps reduce lamp end da

Fluorescent lamp
Click here to download the full size of the above Circuit.

rkening. [2] A fluorescent lamp or fluorescent tube is a low pressure mercury-vapor gas-discharge lamp that uses fluorescence to produce visible light. An electric current in the gas excites mercury vapor which produces short-wave ultraviolet light that then causes a phosphor coating on the inside of the bulb to glow. A fluorescent lamp converts electrical energy into useful light much more efficiently than incandescent lamps. The luminous efficacy of a fluorescent light bulb can exceed 100 lumens per watt, several times the efficacy of an incandescent bulb with comparable light output. Fluorescent lamp fixtures are more costly than incandescent lamps because they require a ballast to regulate the current through the lamp, but the lower energy cost typically offsets the higher initial cost. Compact fluorescent lamps are now available in the same popular sizes as incandescents and are used as an energy-saving alternative in homes. Because they contain mercury, many fluorescent lamps are classified as hazardous waste. The United States Environmental Protection Agency recommends that fluorescent lamps be segregated from general waste for recycling or safe disposal. [3] Fluorescence of certain rocks and other substances had been observed for hundreds of years before its nature was understood. By the middle of the 19th century, experimenters had observed a radiant glow emanating from partially evacuated glass vessels through...

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Sound Level Indicator LM3915
    Spider robot with PIC16F84
    Sola Sound ToneBender
    LED Audio VU Meter Circuit
    soft light dimmer circuit
    Automatic Heat Detector
    Multitone Siren
    Arduino Thermostat
    50WOTL amplifier circuit
    LED digital clock language timekeeping circuit
    LT4060 with temperature-controlled 2A NiMH battery charger
    Low pressure break alarm circuit diagram