About: http://webisa.webdatacommons.org/25248342

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	Flash exposure is a more complex subject than I can answer but I believe the basics are that you mostly ignore ambient light when using flash as your main source of lighting.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com