1. IES Practical Guide to Photometry.
2. IES Lighting Handbook (1981).
3. IES Approved Method for Photometric Testing of Indoor Luminaires Using HID or Filament Lamps - IES Procedures Committee (Project 37).
4. IES Guide to Lamp Seasoning (LM–54).
5. Hi-Tek Testing Laboratories, Crawfordsville, IN.