Module 4, Lesson 4 Flashcards
HID (High Intensity Discharge) light source characteristics
Brightest and most efficient (2006), Light large areas, very high output, contains an arching element inside a pressurized bulb, requires a ballast, requires a “light up” time, slow “restarts”, and wide voltage range
HID common voltage range
120-480
Average time it takes and HID to fully light up
3-15 minutes
4 major families of HID lamps
Mercury vapor, metal halide, high pressure sodium, and lower pressure sodium
Mercury vapor characteristics
50 lumens of light per watt consumed
Metal halide characteristics
80-100 lumens of light output consumed, step up from mercury vapor, operates at high temps, 3-5 minute start up, 8-20 minute hot restart, and depreciates faster
High pressure sodium characteristics
Most efficient of the four, takes only 4 minutes to fully turn on, and only 1 minute for “hot restart”
Low pressure sodium characteristics
Comes in completely different shapes, 7 to 15 minute start ups, immediate hot restarts, and several gasses make it up
Basic difference between the 4 major families
The chemical gas compounds in the gas tubes and all have different efficiency
Metal Halide HID’s can heat up to
55 degrees Celsius or (150 F)
Another common name for HID ballasts is
Power packs
HID luminaries for different applications
Industrial, commercial, and outdoor
Industrial luminaries
Used around heavy assembly lines
Commercial luminaries
Sports arenas and more concerned with aesthetic quality
Outdoor luminaries
Football stadiums, parking lots, and mounted on poles
What are HID’s called that are 18 feet above the work place
High bay
What are HID’s called that are 10 feet above the work place
Low bay
2 options for ballasts
They can be self-contained (inside the HID) or external (mounted)
Voltages that can be used with HID’s
120, 208, 240, 277, 480, and multitap
A starter and ignitor are need for what
The striking of the arc
What does a HID ballast consist of
Coil assembly, core, and capacitor
HID fixture mounts
Ceiling surface-mounted, recessed, or wall-mounted
Specialized HID ballasts are designed to operate at what temp
65 degrees Celsius
Pole-mounted application factors
Weight of the fixture, wind velocity, pole strength, pole height, area of alluminance, and the hardware needed to attach the fixture to the pole
