PLATE COMPACTOR C90-EY20 YOHINO

Light equipment means hand-held tools and 
construction equipment, such as line trimmers,
 handsaws, wheelbarrows, and post-hole diggers.

Light duty is less demanding work, physically and/or mentally
An example would be answering phones instead 
of stocking shelves.
noun. plural lights. Britannica Dictionary definition of LIGHT. 
1. [noncount] : the form of energy that makes it possible to see things 
 the brightness produced by the sun, by fire, by a lamp, etc.

Light is defined as the electromagnetic radiation with wavelengths 
between 380 and 750 nm which is visible to the human eye.

Light is a source of illumination, whether a natural one (like the sun) 
or an artificial one (like your lamp). Like light itself, the word
 can take a lot of different forms — it can be a noun, an adjective, 
or a verb, and it can mean "bright" or "not heavy".
 
RTW programs include temporary light-, limited- and
 modified-duty assignments. Light duty typically involves
 excusing an employee from performing certain tasks that
 he or she would normally perform. Limited duty may reduce
 the number of hours that someone normally works in a day.