What is the Most Effective Way to Manage Commercial Lighting?
Only apply as much light as minimally needed using fully shielded fixtures that prevent glare and excessive upward light spill to assure safe and secure conditions on your property. Install an astronomical time clock to assure needless energy is not wasted after business hours. An astronomical time clock uses a photosensor that automatically synchronizes switch settings with varying daylight that changes during the seasons and does not require resetting each time there is a power failure.
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The efficiency of a light source is simply the fraction of electrical energy converted to light, i.e. watts of visible light produced for each watt of electrical power with no concern about the wavelength where the energy is being radiated. For example, a 100 watt incandescent lamp converts 7% of the electrical energy into light; discharge lamps convert 25% to 40% into light.
In most cases a table lamp with a soft shade is not suited for doing tasks that require seeing small details, such as reading or cross-stitch. Table lamps are designed to look pretty with your furniture and give a soft, warm glow. The shade diffuses the light and prevents more intense, focused light from reaching your task.