Light intensity is measured in lux. On a very sunny summer's day, levels may be as high as 100,000 lux. On a cloudy day, the light intensity is unlikely to exceed 1,500 lux, while indoors, even in a well-lit room, light intensity with normal lamps is often as low as 500 lux. That's not enough to keep us feeling our best! If you use the EnergyLight for just 30 minutes a day at a light intensity of 10,000 lux, you'll notice an improvement in your energy level and mood after just 5 days' use.
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