Skip to main content

Table 2 Control and treatment condition lighting measurements

From: Home-based light therapy for fatigue following acquired brain injury: a pilot randomized controlled trial

Location Time of day N Photopic lux
Mean ± SD
CCT (K)
Mean ± SD
Irradiance uW/cm2
Mean ± SD
S-cone-opic a-opic EDI (lux)
Mean ± SD
M-cone-opic a-opic EDI (lux)
Mean ± SD
L-cone-opic a-opic EDI (lux)
Mean ± SD
Rhodopic a-opic EDI (lux)
Mean ± SD
Melanopic a-opic EDI (lux)
Mean ± SD
Melanopic DER
Mean ± SD
Control lighting
  Bedroom Day 24 338.06 ± 269.96 3539 ± 861 106.87 ± 100.27 165.68 ± 134.47 290.39 ± 230.74 340.31 ± 271.31 223.12 ± 176.15 201.69 ± 159.17 0.57 ± 0.13
Evening 22 251.86 ± 175.24 3297 ± 946 70.19 ± 62.77 105.81 ± 100.42 209.51 ± 150.92 254.02 ± 175.99 150.26 ± 117.87 131.79 ± 108.46 0.50 ± 0.13
  Bathroom Day 18 490.07 ± 488.26 3660 ± 978 171.62 ± 251.86 214.99 ± 206.73 410.30 ± 391.30 494.63 ± 497.66 302.57 ± 282.42 267.97 ± 250.35 0.57 ± 0.13
Evening 8 526.13 ± 271.62 3615 ± 1162 160.96 ± 83.85 239.40 ± 159.44 441.69 ± 227.45 528.46 ± 273.61 318.22 ± 170.36 278.33 ± 153.57 0.53 ± 0.15
  Living Day 23 329.68 ± 252.36 3255 ± 4501 99.73 ± 92.50 135.44 ± 111.39 274.50 ± 209.58 332.98 ± 254.97 199.26 ± 154.86 175.37 ± 138.60 0.53 ± 0.09
Evening 20 211.23 ± 150.79 2988 ± 360 62.58 ± 49.48 73.10 ± 58.80 170.00 ± 121.29 213.93 ± 152.57 114.27 ± 82.48 97.10 ± 71.46 0.47 ± 0.08
  Dining Day 16 441.66 ± 328.29 3532 ± 751 138.39 ± 125.58 223.66 ± 176.40 367.88 ± 286.16 440.28 ± 331.79 284.34 ± 216.55 267.66 ± 194.53 0.58 ± 0.13
Evening 12 350.06 ± 232.39 3402 ± 1002 107.14 ± 77.03 155.92 ± 146.97 292.40 ± 204.06 351.86 ± 229.13 209.35 ± 153.78 181.89 ± 133.46 0.52 ± 0.13
  Kitchen Day 21 462.09 ± 321.32 3507 ± 653 136.49 ± 127.84 231.27 ± 193.02 397.13 ± 284.48 464.98 ± 322.92 304.77 ± 233.42 275.71 ± 217.17 0.57 ± 0.09
Evening 14 327.66 ± 197.03 3369 ± 770 90.99 ± 72.66 157.89 ± 137.04 278.18 ± 177.87 329.32 ± 196.21 206.32 ± 147.27 183.85 ± 137.21 0.52 ± 0.10
  Study Day 10 322.66 ± 319.21 3267 ± 544 92.96 ± 137.85 152.28 ± 199.59 275.83 ± 292.53 325.33 ± 319.75 210.98 ± 253.61 190.39 ± 239.65 0.53 ± 0.11
Evening 8 190.25 ± 99.93 2991 ± 403 44.57 ± 35.31 68.95 ± 40.91 153.95 ± 81.89 192.72 ± 101.04 104.72 ± 57.47 89.81 ± 49.97 0.46 ± 0.08
Treatment lighting
  Bedroom Day 19 329.20 ± 311.48 5219 ± 527 92.73 ± 109.31 261.67 ± 253.73 311.77 ± 294.11 327.36 ± 310.04 279.28 ± 263.85 268.43 ± 254.35 0.82 ± 0.09
Evening 20 195.40 ± 173.56 2685 ± 365 53.52 ± 52.50 56.94 ± 59.21 153.28 ± 137.97 198.43 ± 175.63 97.79 ± 89.93 80.16 ± 74.37 0.39 ± 0.08
  Bathroom Day 16 482.24 ± 351.35 4984 ± 897 140.04 ± 123.63 358.95 ± 280.30 447.88 ± 326.62 479.65 ± 349.97 387.03 ± 285.93 366.03 ± 273.53 0.75 ± 0.12
Evening 6 321.87 ± 225.76 2785 ± 183 88.91 ± 75.97 92.81 ± 62.84 252.55 ± 174.79 325.97 ± 228.96 158.34 ± 107.19 127.51 ± 85.04 0.40 ± 0.03
  Living Day 19 310.65 ± 179.67 5434 ± 588 89.74 ± 73.36 260.87 ± 163.21 295.11 ± 172.71 308.50 ± 178.30 264.92 ± 158.66 255.27 ± 154.36 0.81 ± 0.06
Evening 18 157.42 ± 180.62 2910 ± 517 46.74 ± 57.41 52.91 ± 65.12 126.45 ± 146.31 159.20 ± 182.33 83.60 ± 97.86 70.00 ± 82.32 0.44 ± 0.08
  Dining Day 15 573.92 ± 498.79 5252 ± 1049 150.70 ± 147.44 479.79 ± 449.44 542.86 ± 477.67 571.38 ± 496.10 487.74 ± 439.60 470.56 ± 428.79 0.79 ± 0.12
Evening 9 473.78 ± 390.72 2947 ± 196 126.16 ± 124.14 164.18 ± 137.06 383.14 ± 316.41 478.48 ± 394.27 255.46 ± 210.78 214.69 ± 176.66 0.44 ± 0.04
  Kitchen Day 20 518.73 ± 432.48 5179 ± 963 163.82 ± 171.25 420.19 ± 386.29 488.28 ± 418.67 516.28 ± 429.39 434.37 ± 389.77 416.71 ± 379.94 0.78 ± 0.13
Evening 8 336.85 ± 213.52 3050 ± 214.92 90.62 ± 76.69 118.48 ± 70.14 272.25 ± 168.66 340.09 ± 215.32 182.48 ± 108.11 153.06 ± 87.90 0.46 ± 0.06
  Study Day 9 385.50 ± 438.61 5586 ± 1001 121.02 ± 191.54 331.67 ± 367.51 366.42 ± 415.20 384.23 ± 438.07 333.98 ± 379.92 323.71 ± 367.71 0.82 ± 0.13
Evening 6 92.57 ± 80.97 2835 ± 584 22.67 ± 25.60 27.76 ± 27.26 73.29 ± 65.34 93.88 ± 81.68 47.40 ± 42.85 39.20 ± 35.55 0.43 ± 0.12
  1. 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 (final two columns). This was typically associated with a daytime increase and evening decrease in CCT during the Treatment
  2. Notes. Abbreviations: CCT correlated color temperature, EDI Equivalent Daylight Illuminance, DER Daylight Equivalent Ratio. Only the melDER is shown here; DER values for the other photoreceptors can be calculated by dividing the α-opic EDI value by the photopic lux provided