About: http://webisa.webdatacommons.org/39171063

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	But, if the spot light is 20 ft away, then a model with a radius of (say) 5 inches will have a maximum error in the angle of light of arctan(5/240) = 1 degree -- for most things this is not really a problem.
http://www.w3.org/ns/prov#wasQuotedFrom	builditsolar.com