![]() ![]() The values listed below for LPD come from the 2021 version of the International Energy Conservation Code (IECC 2021) and are based on the Space-By-Space method of calculation. Lighting power density is established by local and international codes. ![]() – essentially, if the component or device is involved in lighting, it must be included in the calculation. ![]() Included in the watt measurement is all power consumed by light fixtures, ballasts, controls, transformers, etc. In the United States, LPD is measured in watts per square foot. Lighting power density is the amount of power used by lighting per unit of building area. The lighting levels listed below come from the Handbook as well as various other lighting references. The most cited reference for lighting levels is the IESNA Lighting Handbook, which is published by the Illuminating Engineering Society. Detailed tasks like drafting require more light, while general tasks like walking can be accomplished with less light. We need to provide enough light to allow people to accomplish see their tasks, but not so much light that it is hard to see the tasks – over lighting is just as bad as under lighting. PARS are sold in chrome or black finish the DJs love chrome for a flashy look.Diagram of Foot Candle vs Lux - Illumination ![]() I have used 1000 watt PAR 64’s for backlighting concert performers, a common application. PAR 16 is the smallest instrument the PAR 64 the largest. Buy your PARS by the numbers – the higher the number, the more light they produce. I have used these in industrial shows, but they are only useful for short distance throws. Mini PARS are available for $29 each new. When budgets are tight and control of the beam is not critical, I have used PAR cans to light entire shows. New PARS aren’t that much more expensive. I buy mine used for $60 each, complete with lamp, clamp and color frame. They are available with wide, medium and narrow reflectors also ultra wide and ultra narrow and even pencil thin beams for special effects. Since floodlights are basically uncontrollable, lacking lenses and focal adjustments, the PAR does one job well – it throws lots of light. PAR cans are floodlights with parabolic aluminized reflector lamps similar to the sealed beam headlights used on automobiles. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |