Archive for the ‘C- D’ Category
Capacitors
Monday, February 9th, 2009
With Magnetic HID ballasts (i.e. Metal Halide Ballast Kits), (175 Watt and Up) capacitors are required to improve the power factor. This allows the number of light bulbs that can be operated on a circuit nearly doubles (more fixtures can be put on one line). In large projects, power factor correction (HPF) is also required [...]
Cold Start Time of Bulbs
Monday, February 9th, 2009
Cold Start Time is the amount of time elapsed from the start of ballast (i.e. HPS Ballast) voltage to ignition of the arc discharge in the light bulb. (i.e. HPS Bulbs) An example of a Cold Weather Fluorescent Ballast is a Sign Ballast.
Constant Wattage Autotransformer (CWA) Ballast
Monday, February 9th, 2009
Constant Wattage Autotransformer (CWA) Ballast is a magnetic ballast (i.e. T12 Ballast) transformer ballast circuit that has a capacitor in series with the light bulb; compared to many other ballasts, the Constant Wattage Autotransformer regulates over a greater input voltage range, making the lamp current nearly constant.
Constant Wattage Isolated or CWI Ballast
Monday, February 9th, 2009
CWI Ballast (i.e. Bulb Ballast) is magnetic lead ballast circuit having a fully-isolated secondary coil winding; it has a HPF capacitor in series with the light bulb (i.e. HPS Bulbs) and the equivalent performance features as the CWA ballast
Correlated Color Temperature or CCT
Monday, February 9th, 2009
Correlated Color Temperature (CCT) is the perceived “color” of the naked eye of the light bulb spectrum emitted by a lamp expressed in Kelvin (K) units In buildings, it is very important to take the color temperature into consideration of the light fixtures (i.e. Metal Halide Fixtures) used. To promote relaxation, a warmer (i.e., lower [...]
CRI or Color Rendering Index (Ra)
Monday, February 9th, 2009
Color Rendering Index (CRI or Ra) is a measure of a the lightbulbs’s ability to render colors (color spectrum) relative to a standard of 100. The higher the CRI, the better the color rendering.
Current Crest Factor – (CCF)
Tuesday, February 10th, 2009
Current Crest Factor is the ratio of the peak-to-rms value of light bulb current; (i.e. metal halide ballast CCF range from 1.5 to 1.8) The Crest Factor is an easy and useful calculation that gives the person analysing a good idea of how much impacting is occurring in a time waveform. This can be useful [...]