As seen on TV
LED Shower Light

Blue light means the water is cold; Red light means it has warmed up to 89 F (32 C).
No batteries needed - powered by internal turbine.
Installs in minutes to standard (3/4") shower pipes.
Includes a Flow Regulator that limits maximum water flow to 2.5 gallons per minute at 80 psi (might affect Shower Light performance depending on your water
Pressure).
Approx. 4" in diameter