a short tube should try to use the sun during the midday hours where of quartz glass, housing a coiled filament that runs the a combination of daylight and skylight is present, length of the tube
Tungsten-halogen lamp. Widely used in television and film production, an incandescent lamp with a number of internal improvements over standard lamps, including a consistent color temperature and uniform light output over its life.
A halogen bulb with glass made of quartz. This should never be touched with bare skin as an oily mark will appear that will cause the structure to weaken. If touched, clean the glass with an alcohol such as methylated spirits or a turpentine.