Rhotometry radiometry units Comparison of photometric units: luminous flux, luminous intensity, luminous exitance, luminance and illuminance (purple) and radiometric units: radiant flux, radiant intensity, radiant exitance, radiance and irradiance (red) by CMG Lee based on http://slideshare.net/chinkitkit/chapter-1-radiometryandphotometry slide 2. Non-directional Directional Over-all Perunitarea ↓ ∂ ∂A → ∂ ∂Ω Photometry Radiometry Luminousefficacy K(lm/W) Luminous flux Φv(lumen, lm = cd·sr) Radiant flux Φe(watt, W) Luminous intensity Iv(candela, cd = lm/sr) Radiant intensity Ie,Ω(W/sr) Exiting: Luminous exitance Mv(lm/m²) Radiant exitance Me(W/m²) Incoming: Illuminance Ev(lux, lx = lm/m²) Irradiance Ee(W/m²) Luminance Lv(nit, nt = cd/m²) Radiance Le,Ω(W/sr/m²)
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