When sourcing follow spots, prioritize the Light Source Type (LED is now preferred for energy efficiency and low heat, while Discharge lamps like HMI offer high intensity for long throws). Key metrics include Luminous Flux (Lumens) for brightness, Color Temperature (CCT)—typically 3200K to 6000K—and a Color Rendering Index (CRI) of ≥90 to ensure skin tones appear natural under the beam. Additionally, verify the Zoom Range (e.g., 5°–15°) to ensure the beam can cover the required distance from the booth to the stage.