| Title |
The Changes in Economical Efficiency of Indoor Light Sources Over the Past Decade |
| Authors |
Chin-Woo Yi ; Seong-Kuk Hur |
| DOI |
http://doi.org/10.5207/JIEIE.2025.39.2.84 |
| Keywords |
Economical efficiency; Fluorescent lamps; Incandescent lamps; Interior lighting; Lamp efficacy; LED lamps |
| Abstract |
In this paper to compare the economical efficiency of light sources for interior lighting last 10 years. The raw data were collected in February 2013 at Orlando Florida, USA and May 2024 at Chicago Illinois, USA. The compared light sources are incandescent lamps, halogen lamps, compact fluorescent lamps, tubular fluorescent lamps and LED lamps. The variables are average light flux, prices, maintenance costs, average lamp life, average input power and power rates. And we investigated the changes in unit cost and efficacy over 10 years for three types of fluorescent lamps, two types of incandescent lamps, and two types of LED lamps for which information on lamp type, power consumption, luminous flux, and price could be obtained. The results show that the most economical light source among the compared light sources was the fluorescent lamp in 2013, but it changed to the LED lamp in 2024. Efficacy has remained almost unchanged for fluorescent lamps and incandescent bulbs over the past 10 years, but has increased by about 2.5 times for LED lamps. |