scope:

Objective and Scope

This Approved Method applies to lighting equipment having a total field angle of less than ten degrees (refer to Normative Reference 2.1). (Section 6.6 provides an example for obtaining test data on field angle.) This includes equipment in which light is controlled by reflectors, lenses, or their combinations. The document applies to projectors with a variety of light sources, including tungsten filament, tungsten-halogen, and high-intensity discharge lamps. It does not apply to projector systems composed of arrays of light emitting diodes. For luminaires where the total field spread is equal to or exceeds ten degrees, the reader is referred to ANSI/IES LM-35-20.¹ Photometric testing of reflector-type lamps is described in ANSI/IES LM-20-20.²