Shield Type Subgroup

Shields typically reduce luminaire efficacy due to light absorption, so they may be eligible for an efficacy allowance based on distribution performance. Shield type sub-groups eligible for LUNA efficacy allowances are house-side shields (HSS), cul-de-sac shields (CSS), and front-side shields (FSS), provided that the zonal lumen differences between the shielded and unshielded version meet the requirements noted in the allowance section. Shield type subgroups cannot be combined. A HSS subgroup, for example, can only contain products with house-side shields, not cul-de-sac shields or front-side shields. Other shield types can be used to meet the requirement that a roadway/area/decorative product must have a shield option/accessory; however, they are not eligible for a shielding efficacy allowance.