ཨ་རྡོ་ནུས་སུ་ལ་བཅར་འདྲི་བྱས་པ། སྔ་དུམ། - འོད་དཀར་དྲ་ཚིགས།
What is the relationship between the luminous flux (measured in lumens) and the illuminance (measured in lux)?
Light, Action, Illumination: These three words can be used to describe the general topics in the given texts