Light therapy devices are used to help regulate circadian rhythms, manage delayed sleep–wake phase disorder, reduce jet lag, and alleviate symptoms of seasonal affective disorder. Sleep Review‘s portable light therapy guide compares the devices on parameters such as form factor, light color, bandwidth, intensity, dimensions, and price. The light therapy devices compared are:CAREX TheraLightHelight SleepLucimed LuminetteCompany: CAREX Helight Lucimed Portable Light Therapy: TheraLight Helight Sleep Luminette glasses Website: carex.com/products/carex-theralite-mood-and-energy-enhancing-bright-light-therapy-lamp helight.com myluminette.com Description: Compact size for confined spaces and travel use. Blocks 100% of UV to keep your eyes and skin protected A patented red light sleep therapy device. Information for this guide is based on data submitted by light therapy marketers.