20 optionally provides a means of additionally focusing or de focusing the light into a more or less intense beam in other words the irradiated light shining on the sample 14 is optionally focused rather than collimated in an alternate embodiment more than one light source 10 can be used such as an array of infrared emitters typically the array would be focused on the same point it is preferred that the light source 10 be placed such that it directly illuminates the sample 14 to be analyzed through the first window 12 with no fiber optic or other device other than the first window 12 itself being disposed between the light source 10 and the sample 14 in the preferred embodiment the illumination spot size from the light source 10 onto the sample 14 is approximately 1 to 3 inches in diameter creating a spot of light between 0 5 and 10 square inches effectively the incident light 48 shines through the first window 12 onto the sample 14 to produce reflected light 49 directed towards a second window 13 and analysis chamber where light intensities are analyzed in a colorimeter application detecting for example wall paper the light source 10 is directed towards sample 14 creating a large illumination spot size preferably between 0 5 and 10 square inches reflected light from the sample is analyzed to determine particular color.