In the lighting design, the lamps that meet the requirements of use function and lighting quality, and are easy to install and maintain, and have low long-term running costs should be selected. The following aspects should be considered: (1) Optical characteristics such as light distribution and glare control; (2) Economics, such as luminaire efficiency, initial investment and long-term operating expenses; (3) Special environmental conditions, such as fire hazard, explosion hazard environment, dust, humidity, vibration and chemical corrosion; (4) The shape of the luminaire should be coordinated with the building; (5), the luminaire efficiency (η) is high: η = ΦL / ΦO, depending on the shape and material of the reflector, the size of the exit opening, the diffuser or grid shape and material; (6) IP rating in accordance with environmental conditions.
A floor drain is a plumbing fixture that is installed in the floor of a structure, mainly designed to remove any standing water near it. They are usually round, but can also be square or rectangular. They usually range from 2 to 12 inches (5.1 to 30.5 cm); most are 4 inches (10 cm) in diameter. They have gratings that are made of metal or plastic. The floor around the drain is also sloped to allow the water to flow to the drain. Many residential basements have one or more floor drains, usually near a water heater or washer/dryer. Floor drains can also be found in commercial basements, restrooms, kitchens, refrigerator areas, locker/shower rooms, laundry facilities, and near swimming pools, among other places.
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