1) A GLS Light bulb is also known as a traditional shape standard light bulb. GLS bulbs are used in table lamps and ceiling pendants.
The light equipment efficiency expresses how much of the light is really emitted from the light source to the room.
A bare fluorescent tube emits 100% to the room. A shielded tube emit less - 50% to 80% is common.
The room lighting efficiency express how much of the light is absorbed by the room before entering the activity area.
Light Equipment Efficiency and Room Lighting Efficiency influences on each other. Common values of the product ηe ηr are in the range 0.3 - 0.6.
1000 lux is the recommended light level in a office where detailed drawing work is performed. The room and lighting equipment efficiency can be set to 0.5.
By using standard GLS bulbs - the electric power for the lighting can be calculated to
P = (1000 lumen/m2) / (0.5 (10 lumen/W))
= 200 W/m2
By using standard fluorescent tubes - the electric power for the lighting can be calculated to
P = (1000 lumen/m2) / (0.5 (60 lumen/W))
= 33.3 W/m2
Due to the high energy consumption and the major impact on air condition heat loads standard GLS light bulbs are not an alternative in high illuminance areas.
The table below indicates typically installed electrical power for different light levels:
|Installed effect (W)||Illumination - Light Level (lux)|
|Incandescent GLS bulb lamp||40||80||120||160||200|
Note! Datasheets from manufacturers should always be consulted before detailed engineering. The numbers above do for rough preliminary calculations.
Air Conditioning systems - heating, cooling and dehumidification of indoor air for thermal comfort.
Typical power consumption and running time for common electrical equipment.
The electromagnetic spectrum with wavelengths and frequencies.
Heat loss from electrical equipment like switch-gear, transformers and variable frequency drives.
Heat gain from persons in air conditioned spaces - in btu/hr.
Working activities and light levels - required illuminance.
Energy consumption of lighting systems
Lights vs. power installations in common types of buildings and rooms.
The visible light produced by light sources.
Geometric dilution of light vs. distance.
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