lamps. Tuesday , January 31st , 2017 - 04:50:21 AM
A lumen (lm) is the measure of luminous flux (light in transit), which is defined as light power as perceived by the human eye. When the metric area over which luminous flux is spread is taken into account, the SI measurement of illuminance, or lux (lx), is used. Alternately, when non-metric (foot) area is calculated, the non-SI footcandle (fc) unit is used to measure illuminance. Mathematically, one lux equals one lumen per square meter, or 1 lx= 1 lm/m2. Conversely, one footcandle equals one lumen per square foot, or 1 fc = 1 lm/ft2. Finally, one footcandle is approximately equal to 10.764 lux.
An alternative to low voltage lighting are solar lights. Solar landscape lighting stores energy captured during the day and then when it becomes dark enough, the outside lighting switches on automatically and stay on all night until they run out of battery power. A very good point is that solar lighting dose not use any wiring or external power source Unfortunately the disadvantages of solar lighting is that they give out very low levels of lighting and this gets dimmer as the night goes on.Once the design and type of outdoor lighting fixture is selected, the next important question is voltage. Outdoor light fixtures are available in either 12-volt or 120-volt versions and for houses the best deal is low voltage outdoor lighting. These are easier to install as the system runs on harmless 12-volt current with light weight wiring laid on the ground or buried just below surface. The 120-volt system on other hand is same as used in interior of house and requires precautions and handling. The advantage of high voltage outdoor lighting is that it is permanent using buried conduit whereas the low voltage outdoor lighting is that is easily damaged due to superficial placement of wires.
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