Table 1.

Illuminance and color performance of surgical light without and after 3M film.

	No filter	One layer	Two layers
Illuminance (lux)	54,047	47,051	43,900
CRI Ra	96.7	96.4	95.7
CRI R9	89.9	89.7	83.7
CCT	5264 K	5392 K	5402 K