About: http://webisa.webdatacommons.org/137377369

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, since electronic ballast circuit has become very popular in the lighting industry, these drawbacks are almost eliminated including humming problem by boosting the frequency of the current in the range of 30,000-50,000 Hz.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com