Circadian field photometry

λ wavelength λmax peak wavelength µW/cm 2 microwatt per square centimeter A/Hz ½ amperes per root hertz A/W amperes per watt acv circadian action factor Ap pupil area Ar area of the image at the retina As source area B noise bandwidth [Hz] B(λ) action spectra for blue light hazard (ICNIRP) B(λ) " biological/circadian " action spectra b-lx blue-lx, unit for blue-colored illuminance BYλ hypothetical luminous efficiency function for circadian responses. c(λ) circadian action function cd/m 2 candelas per square meter, unit for luminance dB decibel DC direct current dp pupil diameter dr diameter of the image at the retina ds diameter of the source E Energy Ec corneal irradiance en noise voltage density Er retinal irradiance f frequency f focal length g gram h Planck's constant Hg high-pressure mercury Hz Hertz, unit for frequency Id dark current If feedback (gain) current Ijn Johnson noise current In noise current in noise current density In,e noise current from en in,e noise current density from en Ip photocurrent Itot total noise current J/cm 2 Joules per square centimeter K Kelvin, unit for (color) temperature kB Boltzmann constant kbauds/s kilobauds per second lm/w lumens per watt, unit for luminous efficacy Ls source radiance lx lx, unit for illuminance mA milliampere mAh milliampere hour MB megabyte Mbps megabits per second MHz megahertz mm millimeter Mλ melanopsin-containing retinal ganglion cell spectral efficiency nm nanometer, normal unit for wavelength nV nanovolt pA picoampere Pr retinal power Pλ spectral irradiance at the eye [W/m 2 /nm] Rf feedback (gain) resistance Rsh shunt resistance Rλ photosensitivity Sλ S cone spectral efficiency T temperature [K] V(λ) spectral sensitivity curve for photopic vision V/Hz ½ volts per root hertz V'λ rod spectral efficiency function V10 photopic spectral sensitivity for centrally fixated large target VDC volts, direct current W watt Xec circadian radiation quantity Xv photometric radiation quantity α angular subtense of the source τ lens transmittance Φ luminous flx [lm] Φe,λ Spectral radiance [W·m-2 ] Ω ohm, unit for resistance Ωs solid angle [sr] Symbols and abbreviations 4 +/+ wild type mice ADC analog-to-digital converter AgCl silver chloride CBT core body temperature CBTmin core body temperature minimum CCD charge-coupled device CCT correlated color temperature CD compact disc CIE International Commission on Illumination CMOS complementary metal oxide semiconductor CP constant posture CR constant routine CRH corticotropin-releasing hormone CT circadian time DLMO dim light melatonin onset DLMOff dim ligh melatonin offset DLMOn …