More recent studies have used powerful 10,000- units, which produce comparable or even somewhat superior results with only about half an hour of exposure. This is a practical consideration, as light therapy consists of sitting in front of a light box within this 10,000-lux brightness distance. The greater the 10,000-lux distance, the less restrictive and convenient they are in their use. When light therapy works, it works fast. To remain effective, light therapy must continue until springtime.
Most researchers believe that the devices are as safe as they are effective.
This chart is only for doing a quick comparison between some of the main, more established manufactures and their similar products. There are other companies that are just recently coming out with lights as well, do check them out. Specs and prices change often, so be sure to double check with the different vendors by clicking their links. Based on shipping within the continuous 48 states. Full spectrum light bulbs are made to try to imitate natural sunlight, and like sunlight, they also produce UV rays.