The Light Unit Converter app from Apogee Instruments calculates the conversions between different light units for various light sources including T5 Sylvania fluorescent lights, metal halide, high pressure sodium, and sunlight. Units include shortwave radiation (SW), photosynthetic photon flux (PPF, PPFD), Lux (lx) and Foot-candles (fc, lm/ft2, or ft-c). Definitions: Shortwave Radiation - Shortwave radiation (SW) is radiant energy with wavelengths in the visible (VIS), near-ultraviolet (UV), a