HM REVENUES & BENEFITS CONSIDER THAT S.A.D. IS A MEDICAL CONDITION AND AS SUCH WE CAN SELL LIGHTBOXES FOR PERSONAL USE WITHOUT ADDING THE VAT. THE VAT EXEMPTION SELF DECLARATION IS PART OF THE ORDER PROCESS AND IF YOU ARE SUFFERING FROM ANY OF THE SYMPTOMS LISTED ON THE WEBSITE THEN YOU ARE ENTITLED TO SELECT THE NON VAT PRICE. Combination product that"s a wake-up light in the morning and provides bright light therapy when you need it during the day. Zest can be used as a wake-up light for a natural start to the day. Waking up with a gradual sunrise is a signal for your body to ease production of sleep hormones (e.g. melatonin) and increase those that help you get up and go (e.g. cortisol). Wake-up lights help to keep your sleep cycle on track, boosting mood, energy and productivity levels all day. In addition, you can use Zest for bright light therapy in the winter months or when you"re stuck indoors. Extra bright light is proven to put you in a better mood and make you feel more awake and using Zest every day will make a big difference to symptoms of SAD such as tiredness, over-eating and a lack of energy and motivation. 15 or 30-minute sunrise to wake you up gradually Variable final brightness to create your perfect sunrise Optional alarm beep Timer for bright light therapy sessions Selection of light levels from 20% to 100%; choose maximum brightness for quick light therapy treatment Independently verified to deliver 2,000lux at 50cm LEDs provide extra light output in the blue part of the spectrum that regulates your body clock Recommended treatment time: 30 minutes, though you may find 20 minutes does the trick Handy size for home, work or travel (mains-powered) and ideal for use as part of a jet lag plan.