| Title |
Color Matching in Production of Tri-color Fluorescent Lamp Coated by Single and Double Layer |
| Abstract |
One of the most difficult problems in a tri-band fluorescent lamp manufacture is to search a desired color by an adequate mixing of tri-color phosphors. When a light spectrum of a phosphor is slightly changed or distorted due to process variable or when another spectrum such as from Ar, Kr or a phosphor of calcium halo-phosphate as a first layer exist, it is even more difficult to search a desired color. In this work, a rapid approaching method to a desired light color was studied. Three single-color fluorescent lamps and three-color-mixed fluorescent lamps with different mixing ratios were prepared and the spectra of these lamps were measured, from which the mercury and the argon spectra were eliminated to obtain the modified color coordinates. From this modified color coordinate, lumen ratios of green and blue to red were correlated with their weight ratios. This correlation was applied to the industrial line for single and double layer coating and proven to be valuable as a desired color matching procedure in tri-color fluorescent lamp manufacture. |