Illuminance levels (lux) as a comparison of the various light sources in the patient room, including the Circalux luminaire at full, half and lowest intensities (as determined by the distance of the electronic tag)
| Light source | Illuminance at patient eye (lux) |
| Hospital room overhead light | 1520 |
| Hospital room examination light | 950 |
| Overhead light+examination light | 2470 |
| Circalight @ full (2 ft) | 6 |
| Circalight @ half (5 ft) | 3 |
| Circalight @ dimmest (8 ft) | 1 |