Table 3.
Case 2 Treatment and Control condition lighting measurements.
| Location (Time) | Height, plane | Pos. | Photopic lux TREAT. |
Photopic lux
CONTROL |
CCT (K) TREAT. |
CCT (K)
CONTROL |
Melanopic a-opic EDI (lux) TREAT. |
Melanopic a-opic EDI (lux)
CONTROL |
Melanopic DER TREAT. |
Melanopic DER
CONTROL |
|---|---|---|---|---|---|---|---|---|---|---|
|
Mean ±
SD |
Mean ±
SD |
Mean ±
SD |
Mean ±
SD |
Mean ±
SD |
Mean ±
SD |
Mean ±
SD |
Mean ±
SD |
|||
| Bedroom (Day) | 52'', vert x 4 | A | 27.21 ± 7.71 |
34.10 ± 27.12 |
3,377 ± 559 |
3,626 ± 402 |
19.34 ± 10.18 |
19.83 ± 17.73 |
0.67 ± 0.19 |
0.55 ± 0.05 |
| 72'', horiz | A | 106.47 | 114.23 | 2,136 | 2,500 | 32.13 | 45.19 | 0.30 | 0.40 | |
| Bedroom (Evening) | 52'', vert x 4 | A | 11.69 ± 2.48 |
27.35 ± 15.79 |
2,041 ± 35 |
4,608 ± 305 |
2.76 ± 0.65 |
17.75 ± 11.91 |
0.24 ± 0.01 |
0.63 ± 0.06 |
| 72'', horiz | A | 107.38 | 101.39 | 2,021 | 4,437 | 25.99 | 59.60 | 0.24 | 0.59 | |
| Living (Day) | 52'', vert x 4 | B | 15.30 ± 10.35 |
64.67 ± 66.37 |
4,483 ± 329 |
4,210 ± 216 |
10.55 ± 7.76 |
41.61 ± 43.04 |
0.66 ± 0.05 |
0.63 ± 0.05 |
| 72'', horiz | B | 42.51 | 37.74 | 4,899 | 3,985 | 30.95 | 21.69 | 0.73 | 0.57 | |
| Living (Evening) | 52'', vert x 4 | B | 12.28 ± 8.34b |
84.22 ± 121.61 |
4,463 ± 297b |
4,176 ± 866 |
8.54 ± 6.10b |
70.01 ± 106.35 |
0.68 ± 0.03b |
0.72 ± 0.14 |
| 72'', horiz | B | 25.38 | 28.13 | 4,777 | 3,408 | 18.10 | 16.42 | 0.71 | 0.58 | |
| Kitchen (Day) | 52'', vert x 4 | C | 118.13 ± 99.16 |
184.96 ± 97.99 |
4,493 ± 282 |
4,162 ± 303 |
85.84 ± 72.59 |
118.01 ± 68.57 |
0.71 ± 0.07 |
0.62 ± 0.06 |
| 72'', horiz | C | 83.48 | 230.94 | 4,199 | 3,898 | 53.47 | 128.72 | 0.64 | 0.56 | |
| Kitchen (Evening) | 52'', vert x 4 | C | 62.88 ± 70.13c |
49.58 ± 49.47 |
4,299 ± 164c |
3,712 ± 359 |
42.56 ± 47.66c |
25.26 ± 25.12 |
0.67 ± 0.01c |
0.52 ± 0.06 |
| 72'', horiz | C | 36.12 | 64.12 | 4,165 | 3,897 | 24.19 | 32.24 | 0.67 | 0.50 | |
| Bathroom (Day) | 52'', vert x 4 | D | 40.01 ± 16.72 |
22.80 ± 26.65 |
2,955 ± 432 |
4,841 ± 604 |
17.41 ± 7.40 |
19.62 ± 24.74 |
0.44 ± 0.10 |
0.80 ± 0.07 |
| 72'', horiz | D | 191.64 | 15.90 | 2,836 | 4,642 | 75.50 | 11.95 | 0.39 | 0.75 | |
| Bathroom (Evening) | 52'', vert x 4 | D | No blinds in bathroom.a | 56.80 ± 35.49d |
No blinds in bathroom.a | 2,744 ± 55d |
No blinds in bathroom.a | 21.72 ± 13.65d |
No blinds in bathroom.a | 0.38 ± 0.01d |
| 72'', horiz | D | 176.31 | 2,832 | 68.65 | 0.39 |
CCT, correlated color temperature; EDI, Equivalent Daylight Illuminance; DER, Daylight Equivalent Ratio; Pos., Position. Only the melDER is shown here; DER values for the other photoreceptors, found in Supplementary Materials, can be calculated by dividing the α-opic EDI value by the photopic lux provided.
The aim of the intervention was to increase the melEDI and DER during the day and decrease them during the evening during the Treatment compared to the Control intervention. This was typically associated with a daytime increase and evening decrease in CCT during the Treatment.
Average calculations found in text generated using 72” measurements. Bedroom and bathroom measurements were excluded from Treatment “day” average calculations as these spaces were used exclusively during evenings and daytime lighting was not fitted. The following measures were excluded from Treatment “evening” calculation: Kitchen measurement excluded as this space was used exclusively during daytime and evening lighting was not fitted; Living was excluded from “evening” calculation as daytime lighting was primarily measured, as noted below; Bathroom was excluded as no blinds were available to block natural light from windows in this space.
Bedroom and bathroom measurements were excluded from Control “day” average calculations as these spaces were used exclusively during evenings and daytime lighting was not fitted during Treatment. The following measures were excluded from Control “evening” calculation: Kitchen measurement excluded as this space was used exclusively during daytime and evening lighting was not fitted during Treatment; Living was excluded from “evening” calculation as daytime lighting was primarily measured, as noted below; Bathroom was excluded as no blinds were available to block natural light from windows in this space.
As evening light measurements were taken with window blinds closed, to approximate night time lighting conditions, measurements were not possible in locations without blinds, if assessed during daytime.
Lighting Science GoodNight light (2,175 K, 600 lm) used in a lamp in this space for evening use, with an established M/P of 0.33. It is likely light was blended with overhead daytime lighting at the time of measurement due to researcher error.
Single spectrum high melanopic light only was installed in the kitchen, based on exclusive daytime use. Evening measures are therefore not reflective of actual night time exposure in this location.
Measurement was captured in evening, after sunset.