Studio lighting equipment is available in either continuous or electronic flash configurations. Continuous Lighting is "on" continuously, much like a light bulb or the sun for that matter, enabling you to use your in camera light meter to measure and see how the light falls on your subject. Continuous lighting sources use photoflood, quartz, or HMI (Hydrargyrum Medium-Arc Iodide) bulbs, which can be hot, leading to the use of the term "hot lights." An increasing number of continuous lighting tools use Compact Fluorescent Lamps (CFL) or LEDs, producing what are, in effect, "cool" hot lights.
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