Zastosowanie przesuwnika fazy w strukturze mikrofalowego detektora częstotliwości

The light color quality of LED operating at winter temperatures

“…Until recently, low-pressure fluorescent lamps (FL lamps) were one of the most popular light sources used both in interior lighting installations and in outdoor lighting [1][2][3]. The fluorescent lamps in outdoor lighting are used to illuminate underground passages, parking lots, public transport stops, bus and railway platforms or signs, billboards and advertising panels [4]. The fundamental disadvantage of these types of lamps, as noted in the literature [5], is the fact that with decreasing the ambient temperature (operating temperature of a lamp), the luminous flux also decreases, which adversely affects luminous efficiency (the parameter being a measure of energy saving) [6].…”