Figure 2

Variation of the overall CIE x values in dependency of the reflectivity of the substrate surface for globe-top configurations with radii of 1 mm, 2 mm, and 3 mm. The phosphor concentrations for the different globe-top sizes are adjusted in order to get similar overall CIE x values of about 0.3300 (a) and 0.3800 (b) under the assumption of a diffuse reflectivity of the substrate surface of 85%. The dashed lines show the variation of the CIE x values for a diffuse reflectivity of the substrate surface, the solid lines for a specular reflectivity. GT_r refers to the globe-top radius.