A comparison between fluorescent lamp and led in the preference of indoor illuminance and color temperature: Scale model experiments assuming living rooms

This paper aims to find the preferred combinations of illuminance and color temperature under RGB LED lighting in living rooms and to compare them with those found in the previous research under RGB fluorescent lighting. Subjective experiments were carried out using scale models illuminated by RGB LEDs with the dimmer. "Preference" and "Brightness" were evaluated as the scenes of "Relaxing" and "Getting together". 25 combinations which consist of 5 illuminances (501x, 1001x, 2001x, 4001x, 8001x) and 5 color temperatures (3000K, 3500K, 4200K, 5000K, 6500K) were investigated. Although the color rendering indices under RGB LED lighting were significantly lower than RGB fluorescent lighting, preferred combinations of illuminance and color temperature found were very similar to those under RGB fluorescent lighting.