LED
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Very energy efficient, robust, many colours
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Light is directional not 360 degrees
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Gyekis et al. [79]
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Chemical (Cyalume or glow stick)
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Low failure rate, inexpensive, robust, many colours, 360 degrees of light
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Light intensity is low and variable; light intensity may be affected by temperature
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Barr [45], Holmes and O’Connor [72], Kissick [73], Kehayias et al. [84], Costello et al. [41]
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Incandescent
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Widely available, 360 degrees of light
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Uses a lot of power, emits heat as well as light, fragile
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Faber [71], Floyd et al. [39]
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Fluorescent
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Bright, energy efficient
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Only one colour, fragile
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Aiken [74], Kawaguchi et al. [33], Doherty [24]
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Halogen
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Very bright
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Requires a lot of power, must be tethered to large battery, produces heat, fragile
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Hernandez Jr and Shaw [64], Lindquist and Shaw [86]
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