Apparatus for lighting; electric indoor lighting apparatus; electric indoor lighting installations; electric lamps for indoor lighting; horticultural lighting fixtures; indoor and outdoor lights; indoor fluorescent electrical lighting fittings; indoor fluorescent lighting fixtures; lighting apparatus and installations; street lights; downlights; LED lighting apparatus; lighting apparatus utilising light emitting diodes (LEDs); LED lamps; lighting apparatus utilising light emitting diodes (LEDs); lighting fixtures, parts, panels, systems and accessories