The Light-Heart study is a randomized, double-blind, controlled trial investigating the effects of bright white light (BWL) therapy on depressive symptoms, quality of life, and functioning in patients with Stage B heart failure. The study is a randomized, double-blind, controlled trial of 8 weeks of morning BWL therapy compared with morning dim red light (DRL) treatment in older (60 years or older) 122 Stage B (early, asymptomatic) HF patients.