HLL series is an extremely robust liner LED luminaire in an aluminum housing with a high impact polycarbonate diffuser for use in Zone 1, 2, 21 and 22 arduous environments.Suitable for zone 1, 2, 21 and 22 gas and dust atmospheres.Fixture life and years of maintenance-free operation.Available in cool white 5700K or warm white 3000K.Cooper free aluminum for excellent corrosion and heat transfer properties.With the added benefits of energy savings, lower maintenance, overall lower cost of ownership and importantly, contributes to a greener environment.The use of high quality LED chips, along with Crouse-Hinds' industry know how in extracting heat from electrical products in hazardous, gaseous environment, ensures benchmark longevity for HLL in operation.