Using an indirect luminaire that provides too much uplight will result in the cloudy day effect. When high levels of indirect illumination are used, foot-candle levels may be higher, but students and teachers will perceive the environment as gray . Providing some downlight with perforated holes or a lens in the bottom of the lighting fixture will make people think the atmosphere is brighter. They will feel more comfortable knowing the source of the light. Although fluorescent systems are probably the most popular for classrooms, other light sources may be appropriate for various areas.
Incandescent lamps are the primary source of illumination in most homes.
Fluorescent lamps produce light by activating selected phosphors on the inner surface of the bulb with ultraviolet energy generated by a mercury arc. HID is also a point source, which provides the opportunity for better light control. Investigate the Latest Technology Specular reflectors may be used for classroom applications. Specularity is the measure of a surface1s ability to reflect all the light at the inverse of the angle at which it is received. Many schools are being retrofitted with an industrial channel with a painted baffle under the lamps.