lighting. Friday , April 14th , 2017 - 07:38:58 AM
3. According to the decisions made in the previous step, the variety of styles, brightness levels and the likes can be chosen and bought. In addition, one must also ensure that the transformer will be able to take on the load of all the lights that are to be installed.
A standard incandescent 15W light bulb generates 122 lumens, or 8 lm/W. A CFL (compact fluorescent light) bulb of almost the same lumen capacity (125 lm) requires only 3 watts of energy, producing 42 lm/W. A metal halide light bulb is even more energy efficient, with some halide bulbs generating as much as 115 lm/W. Light bulb energy usage is imperative when considering how much illuminance is required for a room versus how many lighting fixtures are possible. Furthermore, as wattage is increased, so is electrical resistance, as illustrated by the Ohm's Law derivation R= P/I2 (where R= resistance (Ohms), P= power (Watts), and I= current (amperes)). When calculating the amount of lighting required for very large rooms, therefore, or rooms with high ceilings, these basic physical laws must be accounted for.
Welcome to Day 10 of the 30 Day Challenge: How to Start a Vegetable Garden. Yesterday I shared how to make your own mini greenhouses to start your seeds outdoors - even in the snow!
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