Forty-three subjects with DSM-III-R nonpsychotic , unipolar major depression , seasonal subtype , were randomly assigned , in a double-blind manner , to receive 2 weeks of active treatment with a light box ( N = 9 ) or HMU ( N = 12 ) that emitted no visible light , or 2 weeks of placebo treatment with a light box ( N = 12 ) or HMU ( N = 10 ) that emitted no visible light .
