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The most common type of floodlight was the metal-halide lamp, which emits a bright white light (typically 75–100 lumens/Watt). Sodium-vapor lamps are also commonly used for sporting events, as they have a very high lumen to watt ratio (typically 80–140 lumens/Watt), making them a cost-effective choice when certain lux levels must be provided. [4]
Electronic components used to make a simple water detector: battery, resistor, transistor, water sensor and piezoelectric buzzer for audible alert A water detector is an electronic device that is designed to detect the presence of water for purposes such as to provide an alert in time to allow the prevention of water leakage.
In Australia, the Bureau of Meteorology issues a flood watch that covers similar conditions to flood watches in the United States. However, they are known by slightly different names in some areas. In Europe, there is the European Flood Awareness System and the commercial product including app and data services FloodAlert. [3]
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