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Lighting knowledge from YALED Lighting

author: comefrom: createdate:2010-2-24 0:50:51 hits:1243 Tags:

Lighting knowledge,
1)What is a fluorescent lamp?
A high efficiency lamp utilizing an electric discharge through low pressure mercury vapor to produce ultra-violet (UV) energy. The UV excites phosphor materials applied as a thin layer on the inside of a glass tube which makes up the structure of the lamp. The phosphors transform the UV to visible lights.
2)What is a fluorescent lamp ballast and what does it do?
A fluorescent lamp ballast is an electrical transformer. Fluorescent lamps require different voltages at different places in the lamp in a standard rapid start system. There are small filaments at the end of the lamp that require low voltage (approx. 4 volts) to aid in starting the lamp, this is called cathode voltage. The lamp also requires a higher voltage (200 volts or higher depending on lamp type) from end to end on the lamp to operate, this is called arc voltage. The ballast transforms line voltage 120 volts to these requirements. The ballast limits the amount of current that the lamp can draw. This prevents the lamp from drawing too much current and failing.
3)What is the difference between an electronic and a magnetic ballast?
A magnetic ballast uses coiled wire and creates magnetic fields to transform voltage. A magnetic ballast does not change the frequency of the power to the lamp—it remains the same as the input power, in the United States 60 Hz.
An electronic ballast uses solid state components to transform voltage. It also changes the frequency of the power from 60 Hz to 20,000 Hz, or higher, depending on the ballast. Because the electronic ballast doesn’t use coils and electromagnetic fields, it can function more efficiently and cooler than magnetic. The frequency change also greatly reduces any flicker in the lamp due to burn in or improper power.
4)What are recommended illuminance values in the workplace?
Recommended illuminance values vary depending on tasks, size, layout, and other factors. Light has the tools to help you with your lighting layout based on your needs. Contact us for more information
5)How does dimming work in industrial applications?
Fluorescent fixtures can be wired with multiple circuits that can be switched to vary light levels, reducing energy costs. Because HID fixtures contain individual lamps, they do not offer this dimming method. Fluorescent lights can also be dimmed with a dimming ballast. In the case of HID fixtures, lights can only be dimmed to about 50 percent of their full output; even then, the dimming is not linear with the energy consumed, so in some cases very little energy is actually saved.
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