Luke Skaff @ lukeskaff.com decided to build a DIY Sunlight Simulator using wide spectrum filament lamp to be used as light therapy for Seasonal Affective Disorder. During the process he checks for various kinds of lamps and examines their light spectrum. He writes:
Sunlight simulation light boxes are commonly used as light therapy for treatment of Seasonal Affective Disorder (SAD). My mom has SAD and after seeing her wimpy light box I thought there had to be something better out there, after some research I was really surprised at the underwhelming sunlight simulator light therapy options on the market. When I started this project my parents lived in the Northern Virginia DC area of USA where there are many overcast days in the winter months. I love bright work lighting and lighting in general so part of me was happy that was not there was not a good option available on the market so I could be creative and make my own for her. Most light therapy boxes use fluorescent lighting which I have never liked due to its spikes in a few bands on the spectral power distribution (spectral distribution or emission spectra, discussed below). I love the full spectrum light of incandescent and halogens but to get a light bright enough to work for light therapy I needed a bulb in the 1100 watt halogen or 1500 watt incandescent range at minimum (likely much higher for ideal lumens) which is impractical in its power consumption and heat output. The best all around option is a high intensity discharge (HID) light such as a ceramic metal halide which have some of the best Color Rendering Index (CRI), spectral distribution, lifespan, and cost of any non-incandescent light source.
DIY Sunlight Simulator – Light Therapy Light – [Link]