A method for production of titanium particles or other metal of interest by a metallothermic reduction reaction of TiCl4 or other metal chloride in a reaction zone which comprises conducting the reaction in a fluidized bed reaction zone, and recycling particles to the reaction zone to build up particle size. The back-up lighting system is configured to mount onto a support structure of the light fixture. A portion of the leg closest to the substrate may move relative to the substrate. The second member is disposed in proximity to the adjustment member and has at least one engagement surface. Each intermediate section has a straight surface profile along the outer spherical surface.