secondary light source การใช้

• Thomas Research Products was founded in 1997 as a manufacturer of quartz restrike controls which sense when a high intensity discharge light is extinguished, and automatically light a standby secondary light source in commercial and industrial lighting.
• Nevertheless, critic Jason Kaufman felt that the rendition of the boy in the Wildenstein version was aesthetically inferior to the Hermitage, " . . . the face . . . hard and the expression less sweet than bovine . . . [ t ] he features . . . more sharply defined, the eyebrows severely geometrized, and the complexion pink, rather than fleshtone, " and David Van Edwards, noting apparent mistakes in the depiction of the lute in the Wildenstein version, the secondary light source and the inconsistent perspectives of table and sitter, concluded that the painting is not by Caravaggio.