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36. The Committee remains concerned about the extremely harsh regime imposed on detainees in “supermaximum prisons”. The Committee is concerned about the prolonged isolation periods detainees are subjected to, the effect such treatment has on their mental health, and that its purpose may be retribution, in which case it would constitute cruel, inhuman or degrading treatment or punishment (art. 16).The State party should review the regime imposed on detainees in “supermaximum prisons”, in particular the practice of prolonged isolation.
(emphasis in original)
From:
COMMITTEE AGAINST TORTURE
Thirty-sixth session
1-19 May 2006
CONSIDERATION OF REPORTS SUBMITTED BY STATES PARTIES
UNDER ARTICLE 19 OF THE CONVENTION
Conclusions and recommendations of the Committee against Torture
UNITED STATES OF AMERICA
http://www.unhchr.ch/tbs/doc.nsf/898586b1dc7b4043c1256a450044f331/e2d4f5b2dccc0a4cc12571ee00290ce0/$FILE/G0643225.pdf
They don't consider the case of adding lights and noise to the detention.