Illumination
... Tungsten cathode Preheated Type Fluorescent lamp: In these types, the electrons are produced by thermionic emission. Lower starting and operating voltages are adequate. A transient voltage of 300-600 V, applied by the starter, initiates the arc stream. The cathodes, which are coated with emitting ma ...
... Tungsten cathode Preheated Type Fluorescent lamp: In these types, the electrons are produced by thermionic emission. Lower starting and operating voltages are adequate. A transient voltage of 300-600 V, applied by the starter, initiates the arc stream. The cathodes, which are coated with emitting ma ...
Full Size Light Bulb Comparison Poster 60”x40”
... be lit by a light bulb. Edison and Swan merged their companies and together they were the first to design a bulb that was commercially viable. ...
... be lit by a light bulb. Edison and Swan merged their companies and together they were the first to design a bulb that was commercially viable. ...
Sustainable Light Bulb Purchasing Protocols
... lamp. A fluorescent light bulb is designed to produce light without heat. Electrons collide with mercury atoms to produce an atomic emission of ultraviolet light. This ultraviolet light is then converted to visible light by the layer of white phosphor powders on the inside of the lamp’s glass envelo ...
... lamp. A fluorescent light bulb is designed to produce light without heat. Electrons collide with mercury atoms to produce an atomic emission of ultraviolet light. This ultraviolet light is then converted to visible light by the layer of white phosphor powders on the inside of the lamp’s glass envelo ...
Sources of Light Energy Worksheet
... Name:_______________________ Date:_______________________ Class Period:_______________________ ...
... Name:_______________________ Date:_______________________ Class Period:_______________________ ...
Compact fluorescent lamp
A compact fluorescent lamp (CFL), also called compact fluorescent light, energy-saving light, and compact fluorescent tube, is a fluorescent lamp designed to replace an incandescent lamp; some types fit into light fixtures formerly used for incandescent lamps. The lamps use a tube which is curved or folded to fit into the space of an incandescent bulb, and a compact electronic ballast in the base of the lamp.Compared to general-service incandescent lamps giving the same amount of visible light, CFLs use one-fifth to one-third the electric power, and last eight to fifteen times longer. A CFL has a higher purchase price than an incandescent lamp, but can save over five times its purchase price in electricity costs over the lamp's lifetime. Like all fluorescent lamps, CFLs contain toxic mercury which complicates their disposal. In many countries, governments have established recycling schemes for CFLs and glass generally.The principle of operation in a CFL bulb remains the same as in other fluorescent lighting: electrons that are bound to mercury atoms are excited to states where they will radiate ultraviolet light as they return to a lower energy level; this emitted ultraviolet light is converted into visible light as it strikes the fluorescent coating on the bulb (as well as into heat when absorbed by other materials such as glass).CFLs radiate a spectral power distribution that is different from that of incandescent lamps. Improved phosphor formulations have improved the perceived color of the light emitted by CFLs, such that some sources rate the best ""soft white"" CFLs as subjectively similar in color to standard incandescent lamps.White LED lamps now compete with CFLs for high-efficiency house lighting.