The TAP-17 is a wireless task ambient photosensor designed for indoor use.
The TAP-17 uses energy harvesting solar cells for power and uses a very low power radio allowing it to operate in low light conditions for extended periods of time.
The TAP-17 sensor transmits light levels to receivers or controllers which can then activate lighting fixtures based on need. Harvesting the ambient daylight in work and living areas is a well recognized method of conserving energy.