Now this not only extends the bulbs life BUT also creates a brighter, more SUN like light. This is what makes halogen-tungsten bulbs so appealing in use in photography, automobile headlamps, and kitchen lighting. As discussed in No Love for Tungsten, as the filament gets hotter, the faster the atoms oscillate and the brighter the light is produced. A halogen bulb has a more complete light spectrum (rainbow) of light than a regular incandescent bulb because it operates at such a high temperatures, above 2750 °C / 5000 °F. It creates a much brighter and whiter light (more blues and violets), more sun like, but that means its more sun like. These bulbs do produce some UV light, which can be damaging to fabrics and artwork and so they are encased in quartz and not regular glass to absorb the UV rays. They are then also enclosed behind a second piece of glass to protect against the high temperature of the quartz glass, which can cause a fire.
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