Area Of Illumination Formula

The ceiling to desk height is 2 meters.

Area of illumination formula. I candlepower in. Methods for calculating illuminationthere are three method for lightingcalculations 1 watts per square meter method2 lumen or light flux method3 point to point or inverse square law method vijay balu raskar be electrical 3. Room reflectance the room is considered to consist of three main surfaces. Lux total lumens area in square meters.

Each lamp has an initial output efficiency of 85. Surface area bounded by a solid angle of 1 sr now increases to 4m2. A the ceiling cavity b the walls and c the floor cavity or the horizontal working plane. 6 where incandescent lighting is provided lighting equal to one watt per square metre of floor area shall be considered to meet the requirement in subsection b 5 e.

For offices you should plan with 500 lux instead. In physics intensity of radiant energy is the power transferred per unit area where the area is measured on the plane perpendicular to the direction of propagation of the energy in the si system it has units watts per square metre w m 2 it is used most frequently with waves such as acoustic waves or electromagnetic waves such as light or radio waves in which case the average power. 5 illumination from lighting required in subsection b 2 b shall be provided to average levels of not less than 10 lx at floor or tread level. For planes perpendicular to the direction of candlepower inverse square law.

An office area is 20meter length x 10meter width x 3 meter height. The widest diameter of the bright area is 6 cm making it an average field of illumination see methods. 100 lumen per watt. The effective reflectances of the above three surfaces affect the quantity of reflected light.

For circular areas divide the diameter by two to find the radius then square the radius and multiply it by pi which is about 3 14. 1 lux lx 1 footcandle fc x 10 76. Watts per square meter method principal based on rule of thumb. Factors affected on illuminance calculations 1.

Design formulas footcandles lumens. A lighting level of 250 lux for an office area is not compliant to standards. Vijay balu raskar be electrical 2. A source of light giving one candle power in every direction and placed at the center of a sphere of one foot radius would give an illumination of one foot candle at every point in the surface of the sphere and the total flux of light would be 4 pi or 12 57 lumens since the area of the sphere would be 4 pi or 12 57 sq.

Also i would consider to use not cfl but linear fluorescent lamps t5 which have much higher efficiency of approx. Than you get also a better mf of 0 8 and this together reduces the number of fixtures. The tip of the blade is resting against the wall. The area is to be illuminated to a general level of 250 lux using twin lamp 32 watt cfl luminaires with a shr of 1 25.

Illumination method of calculation 1. Calculating light level at a point. Footcandles fc total lumens lm area in square feet. Figure 2 area of illumination from the regular size nondisposable heine optotechnik fibreoptie laryngoscope mounted with a macintosh 4 blade.

Very handy for.