A spectrally selective panel

A spectrally selective panel that is at least partially transmissive for radiation having a wavelength within the visible wavelengths range, the panel comprising:

• first and second panel components that are joined using a suitable optical adhesive;
• a receiving surface for receiving incident radiation;
• at least one reflective component forming a part of an inner surface of one of the first and second panel components and being arranged to reflect a portion of received incident radiation that penetrated through a depth portion of the panel to the reflective component, the at least one reflective component comprising first and second reflective portions that form a series in which the first and second reflective portions alternate, the first reflective portions being inclined by a first angle relative to the receiving surface and the second reflective portions being inclined by a second angle relative to the first reflective portions;
• the at least one reflective component further comprising a multi-layered structure that is positioned at or on each first reflective portion, the multilayer structure being an optical interference coating that results in reflection of at least a portion of incident radiation within an infrared (IR) wavelength;
• wherein a coating other than the multi-layered structure or no coating is positioned on each second reflective portion;
• and
• wherein the panel is arranged such that at least a portion of reflected incident radiation is re-directed within the panel.