Low-intensity blue-enriched white light (750 lux) and standard bright light (10,000 lux) are equally effective in treating SAD. A randomized controlled study. Both treatment conditions were found to be highly effective. The therapeutic effects of low-intensity blue-enriched light were comparable to those of the standard light treatment. Saturation effects may play a role, even with a light intensity of 750 lux. The therapeutic effects of blue-enriched white light in the treatment of SAD at a luminance as low as 750 lux help bring light treatment for SAD within reach of standard workplace and educational lighting systems. (Meesters, Dekker et al. 2011). Light Therapy for Seniors in Long-Term care study at a nursing home in Pennsylvania also showed cognitive improvements. The behavioral assessments were made using the MicroCog Assessment, Geriatric Depression Scale, Profile of Mood States and (Royer, N et al., 2011) daytime sleepiness was evaluated using the Epworth Sleepiness Scale (Golden, Gaynes et al., 2005).
Golden, R. N., B. N. Gaynes, et al. (2005). “The efficacy of light therapy in the treatment of mood disorders: a review and meta-analysis of the evidence.” The American journal of psychiatry 162(4): 656-662.
Meesters, Y., V. Dekker, et al. (2011). “Low-intensity blue-enriched white light (750 lux) and standard bright light (10,000 lux) are equally effective in treating SAD. A randomized controlled study.” BMC psychiatry 11: 17.