Dokladnaya Zapiska Glavnogo Buhgaltera Direktoru Obrazec

The construction of a new building provides architects with an opportunity to embrace new technology to reduce the site’s lifetime carbon footprint. Solid-state lighting’s (SSL) high efficiency and longevity is making it the number one choice for lighting in environmentally-conscious projects. Consumer electronics giant Apple, for example, has standardized on LED lighting for all facilities undergoing construction or major renovation. Manfaat sistem informasi perpustakaan berbasis web. 1 However, fitting SSL to existing buildings brings several challenges.

1> dokladnaya zapiska; spravka dlya sluzhebnogo pol'zovaniya staff. A professional stunt man is standing in for the male lead during the car chase professional'nyi kaskader zamenyaet glavnogo geroya v scenah pogoni na. Etalon, obrazec, mera, standartnyi obrazec, proba (zolota), denezhnaya sistema, denezhnyi standart, uroven'; standartnyi. Using Power-over-Ethernet to Lower Retrofit LED Lighting Costs By Steven Keeping Contributed By Electronic Products 2016-05-26 The construction of a new building provides architects with an opportunity to embrace new technology to reduce the site’s lifetime carbon footprint. Solid-state lighting’s (SSL) high efficiency and longevity is.

Conventional incandescent bulbs or fluorescent tubes run directly from the AC mains supply. In contrast, LEDs require a low-voltage, constant-current DC supply, so connecting SSL to legacy wiring demands the use of specialized power supplies known as LED drivers. Theses LED drivers add expense, take up space, and generate heat. But, recently an alternative­––which is particularly suited to modern office environments and which could significantly push down the cost of retrofitting SSL––has come to the fore: Power-over-Ethernet (PoE). PoE allows the wiring of a local area network (LAN) to carry both data and power to connected devices. This article explains the advantages of PoE-based LED lighting infrastructure over other wiring systems and describes how designers can implement PoE SSL solutions by taking advantage of the latest generation of wide-voltage input, constant-current LED drivers. Retrofitting LEDs A typical office environment is dominated by the steady cool-white glow of fluorescent lighting.

While fluorescent tubes exhibit reasonable efficacy, averaging 60 to 100 lm/W, their electrical performance has been eclipsed by the latest generation of LED lights. Even “mid-power” LEDs such as boast an efficacy of 122 lm/W (at 3 V and 150 mA). High-power devices (which are a little more expensive) such as can push out over 150 lm/W (at 2.95 V and 1.05 A). LEDs also boast longer lifetimes than fluorescent tubes.