sleep   32807

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f.luxometer: iPad Pro
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Circadian and Color
61% as bright as daylight
1h:36 minute phase shift

Good for the office, but too bright after dark
What's this?
Melanopic lux = 101.20
What's this? 6896K
feels like 4968K
0.93 M/P ratio
What's this?
Circadian Metrics

Photoreceptor Responses
α-opic equivalent illuminance

S-cone (Cyanopic lux): 125
Melanopic lux: 101
Rod (Rhodopic lux): 106
M-cone (Chloropic lux): 107
L-cone (Erythropic lux): 104
CIE-recommended SI Units
α-opic spectrally-weighted irradiance

S-cone (Cyanopic): 9.43 µW/cm2
Melanopic: 12.2 µW/cm2
Rod (Rhodopic): 15.0 µW/cm2
M-Cone (Chloropic): 17.3 µW/cm2
L-cone (Erythropic): 18.0 µW/cm2
Action spectrum efficacy (Melanopic lux)

Actinic power / lux: 0.1116 µW/cm2
Actinic power / total power: 32.71%
ED50 (estimates)
Predicted half-saturation constant, based on 90lx Illuminant E equivalent

Total irradiance at ~ED50: 33.07 µW/cm2
Lux at ~ED50: 96.94
Quantal melanopic units (488nm equivalent)
Dacey 2005 (at cornea)

Irradiance: 2.99 x 1013 photons/cm2
Radiance: 1.07 x 1014 photons/cm2/sr

Retinal irradiance range: 5.82 x 1011 to 9.31 x 1012 photons/cm2
Or: 5.82 x 103 to 9.31 x 104 photons/µm2
Rea et al Circadian Light

Rea 2011 CLa: 158.1
Rea 2011 CS: 0.203

Additional Metrics

Blue Light Hazard

Blue light (weighted power): 10.1 µW/cm2
Blue light hazard factor (weighted power/lux): 0.0930 µW/cm2/lux
1h dose: 0.0365 J/cm2
12h dose: 0.438 J/cm2

Peak 'red': 560nm at 0.171 µW/cm2
Peak 'green': 540nm at 0.205 µW/cm2
Peak 'blue': 450nm at 0.419 µW/cm2

Peak wavelength: 450nm at 0.419 µW/cm2
Total irradiance (380-780nm): 37.2 µW/cm2 (0.372 W/m2)
Measurement & Model

Instrument: PR655
Simulated viewing distance: 15"
Scaling model (radiance to irradiance): 0.279

Photopic lux: 109.00
Photopic luminance: 390.8 cd/m2
S/P ratio: 2.18
Color Matching Functions

CIE 1931 x, y chromaticity: 0.3077, 0.3182
(XYZ: 0.1543, 0.1595, 0.1875)
CCT: 6896K with Duv=0.000145

CIE 1964 10-degree chromaticity: 0.3119, 0.3148
CCT: 6675K with Duv=-0.00420

CIE PO06 chromaticity: 0.3102, 0.3231
CCT: 6670K with Duv=0.00108

CIE 1931 2-degree (with Judd-Vos corrections): 0.3174, 0.3384
CCT: 6309K with Duv=0.00491
Start with these
Blue_light  sleep 
yesterday by adamschoen
Poor sleep triggers viral loneliness and social rejection
UC Berkeley researchers have found that sleep-deprived people feel lonelier and less inclined to engage with others, avoiding close contact in much the same way as people with social anxiety.

Worse still, that alienating vibe makes sleep-deprived individuals more socially unattractive to others. Moreover, even well-rested people feel lonely after just a brief encounter with a sleep-deprived person, triggering a viral contagion of social isolation.

...Notably, researchers found that the amount of sleep a person got from one night to the next accurately predicted how lonely and unsociable they would feel from one day to the next.

“This all bodes well if you sleep the necessary seven to nine hours a night, but not so well if you continue to short-change your sleep,” Walker said.

“On a positive note, just one night of good sleep makes you feel more outgoing and socially confident, and furthermore, will attract others to you.” Walker said.
2 days ago by hopeful_monster
Sleeplessness Is Ruining Your Social Life, Warn Scientists
What the second half of the experiment ultimately revealed is that sleeplessness spurs a vicious, self-sustaining cycle of loneliness. Sleep deprivation makes people withdraw from others because their brains tell them that others can’t be trusted. Meanwhile, other people mistrust lonely individuals for withdrawing in the first place. The study authors call this a “behavioral profile of social withdrawal and loneliness.”

“Instead I think it goes back to what Dr. Walker always says: We’re the only species that intentionally sleep-deprive ourselves, so there’s no evolutionary safety net,” she explains. “Society and our brains are not equipped to see it as a weakness.”

In short, when we should be embracing others who are withdrawing, humans naturally tend to isolate them more. The study’s findings function as a much-needed reminder: Perhaps what we see as a dangerous threat should really be seen as a cry for help.  sleep 
2 days ago by hopeful_monster

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