Those who like to shower in the dark--or prefer their showers tinged with a psychedelic, acid trip kind of feel--may find the LED shower light quite illuminating.
The gadget installs to standard shower pipes. Turn the shower on and a blue light tells you the water is cold. A red light means it has warmed to 89° F.
The attachment--which measures approximately 4 inches in diameter--is powered by an internal turbine and doesn't require batteries. It includes a flow regulator that limits maximum water flow to 2.5 gallons per minute at 80 psi.
The light goes for $39.99 at Think Geek, which says the soft glow "makes for a much nicer morning, trust us."
My CNET News colleague Stephen Shankland notes that the LED shower light isn't the first light-dependent water-parsing technology (LDWPT?) to hit the market. His sister has a faucet that runs on a similar principle, and Shank has frequently enjoyed washing his hands by flickering light.