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Table 1 Radiometric and photometric comparisons of the light devices used in the three treatment groups

From: Transcranial bright light treatment via the ear canals in seasonal affective disorder: a randomized, double-blind dose-response study

Group

Spectral characteristics

Luminous flux (lumen)

Illuminance (lux)

Irradiance (μW/cm2)

Photon density (photons/cm2/s)

1

λmax ≈ 448 Nm

1

2386

720

2.00 × 1015

2

λmax ≈ 448 Nm

4

9542

2881

7.98 × 1015

3

λmax ≈ 448 Nm

9

21470

6482

1.80 × 1016

  1. Values are measured and calculated from one randomly selected light source. Illuminance and photon density are measured at a distance of 1 cm from the light source. There were minor differences in the spectral compositions between light sources.
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