Method of manufacturing white light emitting device (led) and apparatus measuring phosphor film

A method of manufacturing a white light emitting device, the method comprising:

• measuring light conversion characteristics of a phosphor film;
• wherein a beam adjusting optical system configured to guide the light beam emitted from the reference light source to be irradiated to the phosphor film as a measurement target and configured to control a beam spot size of the light beam to have a size smaller than an area of a phosphor film unit to be applied to an individual LED device;
• classifying the phosphor film units of the phosphor sheet into a plurality of groups according to measurement results of the light conversion characteristics;
• and
• combining the phosphor film units classified into the plurality of groups and an LED device having predetermined light characteristics so as to obtain target color characteristics.