1) Barbiturate 2) Of a light unit 3) Pertaining to light intensity 4) Phenobarbital 5) Phenobarbitone 6) Purple heart 7) Sodium thiopental Found on https://www.crosswordclues.com/clue/luminal
luminance, luminal 1. The condition or quality of emitting or reflecting light. 2. A measure of the brightness of a surface equal to the amount of luminous flux arriving at, passing through, or leaving a unit area of surface. It is measured in candelas per square meter. A candela is the basic unit of luminous intensity adopted under the Systeme Int... Found on http://www.wordinfo.info/words/index/info/view_unit/1212/4