BCS Low Illumination Solar Cells TDK BCS Low Illumination Solar Cells are thin, lightweight, flexible, amorphous silicon-type, film solar cells available in circular or quadrangle shapes. The BCS Solar Cells offer high power generation efficiency under fluorescent lamps and LED light sources with output stability in low and dim light conditions. These solar cells help reduce cost in battery replacement and wiring while extending the life of the primary battery and the usage time of rechargeable devices. There is no equipment damage or environmental pollution due to liquid leakage. The clean-energy BCS Low Illumination Solar Cells from TDK are suitable as a power source for products used indoors.