As bright as the sun - UVB metal halide lamps

Modern UVB metal halide lamps are primarily used because of the ultraviolet light that is important for vitamin D3 synthesis. They provide the necessary UVB radiation and heat to form the important vitamin D3 in the skin. These lamps are also excellent at that, but they also have another advantage: They also produce very bright visible light. No other illuminant can achieve illuminance levels of around 100,000 lux in the terrarium. This is the value on a nice, cloudless summer day at noon.

Illuminance (measured in lux) describes the luminous flux that hits an illuminated object...

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