A method of processing data traffic at a firewall has been developed. The LDR image, prediction function and residual frame can all be encoded in data from which either the LDR image of HDR image can be recreated. The light emission module includes a centrally disposed aperture that receives a centrally disposed power lead for powering the light emission module. The invention further relates to an article comprising at least one such metal element embedded in a polymer material. The peripheral edge of the second optic contains a pair of locking arms that fit into the clasps contained on the periphery of the first optic to lock the second optic onto the first optic, but allow for rotation of the arms within the clasps.