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<\/figure><\/li><\/ul>\n\n\n\nThus, artificial light to-day has numerous advantages over light which\nhas been furnished by the Creator. It is sometimes stated that it can\nnever compete with daylight in cheapness, inasmuch as the latter costs\nnothing. But this is not true. Even in the residence, daylight costs\nsomething, because windows are more expensive than plain walls. The\nexpense of washing windows is an appreciable percentage of the cost of\ngas or electricity. And there is window-breakage to be considered.<\/p>\n\n\n\n
In the more elaborate buildings of the congested portions of cities,\ndaylight is satisfactory a lesser number of hours than in the outlying\ndistricts. In some stores, offices, and factories artificial light is\nused throughout the day. Still, the daylighting-equipment is installed\nand maintained. Furthermore, when it is considered that much expensive\narea is given to light-courts and much valuable wall space to windows,\nit is seen that the cost of daylight in congested cities is in reality\nconsiderable. Of course, the daylighting-equipment has value in\nventilating, but ventilation may be taken care of in a very satisfactory\nmanner as a separate problem.<\/p>\n\n\n\n The cost of skylights in museums and other large buildings is far\ngreater than that of ordinary ceilings and walls, and the extra\nallowance for heating is appreciable. The expense of maintenance of some\nskylights is considerable. Thus it is seen that the cost and maintenance\nof daylighting-equipment, the loss of valuable rental space and of wall\narea, and the increased expense of heating are factors which challenge\nthe statement that daylight costs nothing. In fact, it is not surprising\nto find that occasionally the elimination of daylighting\u2014the reliance\nupon artificial light alone\u2014has been seriously contemplated. When the\npossibilities of the latter are considered, it is reasonable to expect\nthat it will make greater and greater inroads and that many buildings of\nthe future will be equipped solely with artificial-lighting systems.<\/p>\n\n\n\n Naturally, with the tremendous development of artificial light during\nthe present age, a new profession has arisen. The lighting expert is\nevolving to fill the needs. He is studying the problems of producing and\nutilizing artificial illumination. He deals with the physics of\nlight-production. His studies of utilization carry him into the vast\nfields of physiology and psychology. His is a profession which\neventually will lead into numerous highways and byways of enterprise,\nbecause the possibilities of lighting extend into all those activities\nwhich make their appeal to consciousness through the doorway of vision.\nThese possibilities are limited only by the boundaries of human endeavor\nand in the broadest sense extend even beyond them, for light is one of\nthe most prominent agencies in the scheme of creation. It contributes\nlargely to the safety, the efficiency, and the happiness of civilized\nbeings and beyond all it is a powerful civilizing agency.<\/p>\n","protected":false},"excerpt":{"rendered":" Experiments are being prosecuted to ascertain the possibilities of artificial light in the forcing of plant-growth, and even chickens are made to work longer hours by its use. Artificial light is now modified in color or spectral character to meet many requirements. Daylight has been reproduced in spectral quality so that certain processes requiring accurate … <\/p>\n![\"\"](\"https:\/\/i0.wp.com\/organicthemes.com\/demo\/gamer\/files\/2019\/02\/starcraft-08.jpg?resize=760%2C428&ssl=1\")