Answer: phots

AnswerCrossword Clue
PHOTSUnits of illumination.
PHOTSUnits of illumination, in physics.
PHOTSUnits of light.
PHOTSLensmen: Abbr.
PHOTSLight units
PHOTSUnits of illumination
photsunit of illumination, equal to 1 lumen per square centimeter
photsPHOT, a unit of illumination