ANSI IESNA RP-27.2-2000 pdf free.Recommended Practice for Photobiological Safety for Lamps and Lamp Systems-Measurement Techniques. Lamp Seasoning To maintain stable output during the measurement process and provide reproducible results, lamps shall be seasoned for an appropriate period of time. During the initial period of operation a lamp will change as its components come to equilibrium. If measurements are taken of...