Efficiency of Light Technology
Incandescent Bulbs: 10%
Flourescent Lights: 20%
Light Emitting Diodes (LEDs): 30%
Firefly Butts: 90% efficient

Scientists have succeeded in unraveling the mystery — at the protein structure level — of the mechanism at work in the glowing tail of the “Genji firefly” (Luciola cruciata Motschulsky), which is considered to have the highest luminous efficiency of any known source of light. The results of the joint research carried by the Institute of Physical and Chemical Research (RIKEN) and Kyoto University are to be published in the March 16 edition of the British science journal Nature.

The researchers were able to adjust the chemical composition of the firefly's bioluminescent enzyme, luciferase, to create orange and red glowing bug juice.  According to the article over at Pink Tentacle, work is currently being done to complete the three primary colors by recreating the blue glow from the sea firefly.

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