The later publication from Höving et al. was the basis of a much simpler design. In the Höving et al. publication, the flow reactor tube was sandwiched between a coloured LED (Light Emitting Diode) and LDR (Light Dependent Resistor) and held together in a specially designed 3D printed housing. The simplicity of this design made it a much more tangible prospect for us to be able to reproduce. The reliance of the design however, on a single wavelength LED, and typically low sensitivity LDR, made us question if further enhancements could be made to increase the applicability.