Color rendering affected by scandium vapor mixed with argon using wall-stabilized arc

Summary form only given. The arc lighting to obtain the environment to evacuate, save the life, keep the safety and be comfortable are focus on. The lack of radiation intensity and color rendering is problem because of inappropriate energy balance. This research elucidates the color rendering affected by scandium vapor mixed with argon using wall-stabilized arc. The color rendering, lightness, radiation power and luminous efficacy increases with increasing the current and radius of wall-stabilized arc because of the increment of continuous spectrum emitted from high temperature argon. In addition, they increases with increasing the contamination ratio of scandium vapor using the xy coordinate in chromaticity diagram even if the temperature is low derived from the scandium vapor contamination. This research defines the aim area within 0.5 from the white color point of the xy coordinate in chromaticity diagram. When the wall-stabilized argon arc contaminates the scandium, the mean distance for this aim area becomes small with increasing the current, radius and contamination ratio of scandium. The improvement of color rendering occurs because of the control of balance between the continuous spectrum of argon and line spectrum of scandium with temperature distribution, current and radius of wall-stabilized argon arc. In addition, this appropriate temperature distribution is derived from the arc pinch.