This factor allows for the fact that effective candle power of all lamps or luminous sources deteriorates owing to blackening and/or accumulation of dust or dirt on the globes and reflectors etc. Similarly, walls and ceilings etc., also do not reflect as much light as when they are clean.
What is depreciation factor in lighting?
Depreciation factor • Light emitted by source reduces due to dust or dust decomposition on light. • So, quantity of light reflected from ceiling also get reduced. • This reduction of light can be minimized by cleaning the light fittings or white washing.
What is illumination factor?
When a surface is illuminated by a number of lamps, there is certain amount of wastage due to overlapping of light waves. Its value will be between 1.2 to 1.5. 4) REFLECTION FACTOR: It may be defined as “the ratio of luminous flux leaving the surface to the luminous flux incident on it”.
How is illumination calculated?
To determine the needed lumens, you will need to multiply your room square footage by your room foot-candle requirement. For example, a 100 square foot living room, which needs 10-20 foot-candles, will need 1,000-2,000 lumens. A 100 square foot dining room, which needs 30-40 foot-candles, will need 3,000-4,000 lumens.
What are the types of illumination?
Types of Illumination
- Incandescence produces light by heating a substance.
- Electroluminescence produces light as a result of an electric current passed through a substance.
- Cathodoluminescence produces light as a result of being struck by an electron.
- Photoluminescence produces light as a result of absorption of photons.
What are the 3 methods of depreciation?
There are four methods for depreciation: straight line, declining balance, sum-of-the-years’ digits, and units of production.
- Straight-Line Depreciation.
- Declining Balance Depreciation.
- Sum-of-the-Years’ Digits Depreciation.
- Units of Production Depreciation.
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How do you calculate depreciation factor?
The depreciation rate can also be calculated if the annual depreciation amount is known. The depreciation rate is the annual depreciation amount / total depreciable cost. In this case, the machine has a straight-line depreciation rate of $16,000 / $80,000 = 20%.
How do you calculate Utilisation factor?
It is used to determine the Utilization factor. Hm = Height of luminaire above working plane.
(1) UTILISATION FACTOR (UF):
|Table 1.7 Typical Reluctance Factors|
|Red||20% To 40%|
How do you calculate utilization factor?
Utilization Factor = The time that a equipment is in use./ The total time that it could be in use. Example: The motor may only be used for eight hours a day, 50 weeks a year. The hours of operation would then be 2000 hours, and the motor Utilization factor for a base of 8760 hours per year would be 2000/8760 = 22.83%.
What are the laws of illumination?
The law states that Illuminance at a point on a plane is proportional to the cosine of the angle of light incident (the angle between the direction of the incident light and the normal to the plane). It is the point source Illuminance equation.
Should I use 4 inch or 6 inch recessed lights?
Choose one that will accommodate the height of your ceiling or the size of your wall. 4-inch and 5-inch fixtures are great in kitchens for providing overhead countertop lighting. 6-inch fixtures are most common for general lighting purposes. 7- to 9-inch fixtures will create a wider wash of light.
Is 3000 lumens too bright?
In other words, 3,000 lumens is meant to give a room a brighter light. This is not ideal if you have a small room and it’s a bedroom. You don’t want to blind your eyes when you’re about to go to bed. On the other hand, 2,000 lumens is ideal if you wish to light up a 200 square-foot living room.
What is the level of illumination called?
Light Level or Illuminance, is the amount of light measured in a plane surface (or the total luminous flux incident on a surface, per unit area). The work plane is where the most important tasks in the room or space are performed.
What is the purpose of illumination?
Proper lighting can enhance task performance, improve the appearance of an area, or have positive psychological effects on occupants. Indoor lighting is usually accomplished using light fixtures, and is a key part of interior design. Lighting can also be an intrinsic component of landscape projects.
What does Illumination mean?
1 : the action of illuminating or state of being illuminated: such as. a : spiritual or intellectual enlightenment. b(1) : a lighting up. (2) : decorative lighting or lighting effects.
What does illumination mean in art?
An illuminated manuscript is a manuscript in which the text is supplemented with such decoration as initials, borders (marginalia), and miniature illustrations. … Islamic manuscripts may be referred to as illuminated, illustrated, or painted, though using essentially the same techniques as Western works.