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Spectral Power Distributions “blackbody” Planckian radiators

Spectral Power Distributions “blackbody” Planckian radiators. Planck’s Law h = Planck’s constant k = Boltzman constant c = speed of light λ = wavelength T = absolute temperature. Candle flame (1000K). 100 W tungsten bulb (2856K). “Photoflood” 500 W bulb (3400K).

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Spectral Power Distributions “blackbody” Planckian radiators

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  1. Spectral Power Distributions “blackbody” Planckian radiators

  2. Planck’s Law h = Planck’s constant k = Boltzman constant c = speed of light λ = wavelength T = absolute temperature

  3. Candle flame (1000K)

  4. 100 W tungsten bulb (2856K)

  5. “Photoflood” 500 W bulb (3400K)

  6. Sunlight (5500K)

  7. Skylight (12000K)

  8. Absolute vs. relative spectral power

  9. Planck’s Law h = Planck’s constant k = Boltzman constant c = speed of light λ = wavelength T = absolute temperature

  10. Stefan-Boltzman Law: total power output Total power = σ T4 σ= Stefan-Boltzman constant T = temperature Kelvins

  11. Wein’s Displacement Law: wavelength at peak output λmax= b/T b = 2.898 x 10-3 (m K) T = temperature Kelvins

  12. CIE 1988 photopic visibility function V(λ) nm V(λ) nm V(λ)

  13. CIE 1988 photopic visibility function V(λ) with 2856K & 5500K blackbody radiators 5500K V(λ) 2856K

  14. 5500K V(λ) 2856K CIE 1988 photopic visibility function V(λ) with 2856K & 5500K blackbody radiators

  15. Radiometric constants: (ISO units, distance = meters) Constants: Planck's constant h 6.63E-34 J s speed of light c 3.00E+08 m/s Boltzman's constant k 1.38E-23 J/K Wein's constant b 2.90E-03 m K Stefan-Boltzman constant σ 5.670E-8 W/m2 K4

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