Low-end stability, protocol, load range, service access and thermal conditions all belong in the driver specification.
Start with the load
Confirm LED voltage, current, wattage, channel count and cable distance. Select a driver that operates comfortably within its rated range under real thermal conditions; an oversized or lightly loaded driver can perform poorly even when the headline wattage appears safe.
Define control and low end
The driver must speak the chosen control method and reach the required low level without flicker, noise, stepping or colour mismatch. Record tested combinations rather than allowing substitutions based only on voltage and power.
Make service possible
Drivers produce heat and are common service items. Place them in ventilated, documented, accessible locations with clear zone labels. Avoid hiding them above sealed acoustic ceilings or behind fabric that cannot be removed cleanly.
Good cinema lighting gives the room exactly enough information—and no more.
A practical specification sequence
Define the visual intent and the scene in which the light will operate. Confirm the fitting, driver, control method, circuit and physical access together. Build a representative mock-up where the detail is sensitive, then commission the final level from every seating position with the projection system running.