In at least one embodiment of the wavelength-tunable light source, it comprises an output source, which is capable in operation of generating electromagnetic radiation. When the resulting transgenes were introduced into Xenopus laevis, the photoreceptors degenerated in a manner similar to the degeneration observed in human retinal degenerations. A plurality of second LEDs are disposed on the top side of the base and located within the reflectors. The arrangement includes a first hollow elongated member and a second hollow elongated member, each having a first end with a boat rail arrangement engaging portion thereon. Furthermore provided are a method of identifying a modulator of a myosin, pharmaceutical compositions and methods of treating cardiovascular diseases, cancer, diseases of the central nervous system, viral infections, and infections by parasites of the Apicomplexa family. Energy suppliers may use the system to learn about other suppliers as well as consumers, and to extend offers to consumers for the provision of energy.