#Flood light how to#

' E' is the level of illumination required in lumens/m 2.ĭepreciation factor – it is defined as the ratio of illumination under ideal condition to the illumination under normal condition.

' A' is the surface area to be illuminated in m 2. Step 3 – Calculate the Number of Projectorsįor any desired light intensity over a definite surface, the number of projectors required is obtained from the following formula − Light output – It determines the illumination provided.Īlso, the beam angle of the projector is decided according to the distance of the projector from the surface. −īeam size – It determines the area covered by the beam. The following two considerations enter into the choice of a projector, viz. This step involves the determination of type of projector for the flood lighting. The level of illumination required depends upon the type of building, the purpose of flood lighting and the amount of conflicting light in the vicinity, etc. In this step, the illumination level required is to be calculated.

#Flood light how to#

Let's check how to calculate the number of projectors required in order to get a required level of illumination in flood lighting. In case of medium and wide angle projectors, standard gas filled tungsten filament lamps of 250 W, 500 W or 1000 W are used. These are used for distances below 30 meters.įrom the point of economy, high wattage lamp is used with the wide angle projector, while low wattage lamp is used with the narrow beam projector. The angle of Beam spread ranges from 40° to 90°. These are used for distances between 30 to 70 meters. The angle of Beam spread ranges from 25° to 40°. These are used for distances more than 70 meters. The angle of Beam spread ranges from 12° to 25°. Types of Flood Lighting ProjectorsĪccording to the angle of beam-spread, the projectors used in flood lighting can be classified into following three types viz. In some cases, the projectors may be housed in ornamental stands. Note – As far as possible, the projectors should not be visible.

Thus, the flood lights should be so located that the contours and features of theīuilding are well defined and they should enhance the beauty of the building or monument. The light should fall on the building nearly perpendicular to the building.įor large or tall buildings, non-uniform flood lighting is used. Therefore, the flood lights can be placed on other building or on a suitable point at distances of not more than about 60 meters. In practice, there are two possible locations of projectors for flood lighting, which are −įor small buildings, uniform flood lighting is used.

To illuminate the advertising boards and show-cases, etc. To illuminate the railway yards, car parking, sport stadiums, construction sites, etc. To enhance the beauty of the ancient monuments at night. The flood lighting may be employed for the following purposes − Flood lighting is an artificial light with high-intensity, broad beam. The flooding of large surfaces with light through powerful projectors, where the light sources are concentrated into narrow light beams using specific reflectors is known as flood lighting.