Fluorescent Light Bulbs

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bulbsFluorescent Light Bulbs
 
With a seemingly endless range of possibilities, choosing the right bulb can be a challenge.  Broken bulbs pose a more dangerous risk, and reseachers found that all bulbs tested had cracks, which could allow mercury and mercury vapor to addition, large amounts of UV rays are released when the electric current interacts with the mercury.Since a large nuber of bulbs have cracks, the UV rays are relaesed into the home, and are harmful to human health.The electricity used over the lifetime of a single incandescent bulb costs 5 to 10 times the original purchase price of the bulb itself. The Stony Brook research details are behind a paywall but I found this site with a comprehensive summary of research on CFL emissions of UV radiation: -0781.2011.00576.x/full To summarize briefly, there may be some slight risk of exacerbation of skin problems in highly photosensitive people like many with lupus, but for most folks the amounts of UV radiation from these bulbs are relatively tiny compared to normal sun exposure which is hundreds of times higher.If you are looking to dispose of just small Compact Fluorescent Light bulbs (the spiral” or twisty” CFL bulbs), The Home Depot and Lowes take them back in their stores. Program rapid start ballasts provide an even softer start by first sensing how warm the cathodes are and supplying just enough electricity to turn the tube on. (The cathodes in a tube that was just turned off will be warmer than the cathodes in a tube that`s been turned off for a day.) Because of its less intrusive approach to starting up the tube, very little emission paste is lost resulting in a longer life than the 30,000 hours listed.It is true that not all fluorescent light bulbs last longer than 6 years, but I have replaced nearly all lights in my home with them for several years now and I can not remember when I last bought a new one. A case has been made about the toxicity where if you figure in the amount of energy saved by a fluorescent light bulb, and you work in the average amount of power that comes from coal, and the amount of mercury that is in coal, then if you assume that a fluorescent bulb lasts 10,000 hours, then there is less mercury overall with the fluorescent path.The Energy Independence and Security Act of 2007 (EISA) mandates the phase-out of incandescent light bulbs, and favors energy-efficient compact fluorescent light (CFL) bulbs. 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 lamp to glow A fluorescent lamp converts electrical energy into useful light much more efficiently than incandescent lamps The typical luminous efficacy of fluorescent lighting systems is 50-100 lumens per watt, several times the efficacy of incandescent bulbs with comparable light output.
 
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Decades of invention and development had provided the key components of fluorescent lamps: economically manufactured glass tubing, inert gases for filling the tubes, electrical ballasts, long-lasting electrodes, mercury vapor as a source of luminescence, effective means of producing a reliable electrical discharge, and fluorescent coatings that could be energized by ultraviolet light.When the light is turned on, the electric power heats up the cathode enough for it to emit electrons ( thermionic emission ). These electrons collide with and ionize noble gas atoms inside the bulb surrounding the filament to form a plasma by the process of impact ionization As a result of avalanche ionization , the conductivity of the ionized gas rapidly rises, allowing higher currents to flow through the lamp.The base of the digital diming method comes from the analog one because you still need to use wires to connect to the ballast however in addition to them you are also using a micro-controller which is where the digital aspect comes in. The micro-controller is used to store the digital inputs for example the ballast addresses so you can program several different stages of the dimmed light and use them as you need over longer period of time.In addition, the small amount of liquid mercury contained in the bulb can fall to the floor where vapor can continue to be released until the spill is cleaned up. Workers that may be at risk of exposure would include anyone handling these bulbs, such as custodians and maintenance personnel who may be involved in replacement of bulbs and collecting the bulbs as universal waste for recycling.There`s not much difference in efficiency between brands of CFLs, says Bill Giebler, who`s sized up a whole lot of CFLs in his 10 years heading up green product sourcing at Gaiam Real Goods But there can be a big difference in how long a CFL will last, regardless of who makes it. Some CFLs have a 10,000 hour life while others are rated at only 6,000 hours.

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