In addition to Hardin's geoexchange patents, Hardin Geotechnologies, Inc. dba Preston Lighting has also developed proprietary products for the lighting industry. Because lighting accounts for 50% to 75% of all energy used, inefficient lighting can cost your company a substantial amount. By working with Preston Lighting, we can provide systems for your facility that can reduce your lighting costs by more than 50%.

Preston Lighting has developed lighting fixtures, which replace metal halides, high pressure sodiums, mercury vapors and old fluorescent technologies with a wide range of commercial applications, including manufacturing facilities, retail stores, warehouses and distribution centers.