Orange Sunshine was a 'brand' of LSD that was particularly popular among the drug-using population of US troops fighting in the Vietnam War from the middle of the 1960s to near the end of the war, when supply diminished. It was distributed in the form of a small orange tablet.

Sunshine was produced in two cycles. The first was financed by Billy Hitchcock, who was a multimillionaire money launderer and patron of the Brotherhood of Eternal Love, a quasi-religious organization/commune in California that claimed LSD as its sacrament. The first run, produced by Nicholas Sand and genius chemist Tim Sculley had put as much as ten million hits (doses) on the market between the 1966 'summer of love' in the Haight-Ashbury district of San Francisco, and 1969. The Sand Sunshine was very pure and extoled by none other than Timothy Leary himself as the best stuff available. The second run of about 50 million hits was backed by con-man, CIA informant/agent and major shady guy Ronald Stark. It was produced in Europe by Stark until the early 1970s. The Stark Orange Sunshine acquired a bad rep, becoming the origin of the term 'bad acid,' and one rumor was that it was actually part of a conspiracy to discredit the psychedelic drug scene.

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http://www.erowid.org/chemicals/lsd/lsd_timeline.php3 - Note2
http://www.levity.com/aciddreams/whoswho.html
http://www.druglibrary.org/schaffer/lsd/books/bel2.htm
http://www.bearingwitnessjournal.com/justice/freedom.html
http://www.namebase.org/cgi-bin/nb06?_BROTHERHOOD_ETERNAL_LOVE
http://www.namebase.org/news16.html