| Title |
A Development of a LED Stand Using Illuminance Sensor for Efficient Energy Saving |
| Authors |
Sung-Yong Chun ; Ji-Yea Shin ; Shin-Won Park ; Hwa-Cho Yi ; Chan-Su Lee |
| DOI |
http://dx.doi.org/10.5207/JIEIE.2012.26.9.001 |
| Keywords |
Automatic Lighting Control ; Illuminance Sensor ; Energy Saving ; LED Stand |
| Abstract |
In this paper, we present a new lighting control method considering ambient light in addition to the required lighting illumination for efficient energy saving of a LED stand. We estimate accurate environmental illuminance using a cheap illuminance sensor by modeling measured- and actualilluminance using quadratic polynomial approximation. The relation between PWM(Pulse Width Modulation) duty ratio and illuminance intensity is modeled by a linear model. Illumination of the LED stand is controlled by estimating the difference of required illumination and the estimated ambient illumination. The developed LED stand has reduced electric energy consumption compared with a conventional manually controlled LED stand with the same lighting source. In addition, human subject evaluation shows that the LED stand, which is applied the proposed method, is more satisfactory than conventional ones since the proposed automatic controlled illumination produce more accurately required lighting and it is convenient. |