Retrofit PAR36 LED reflector lamp bulbs featured with IP67 waterproof & rustproof sealed Quartz glass housing, AC/DC 12-24 Volts safe low voltage input, 100-120lm/W real lumen efficiency, 30° spot narrow beam and multi-purpose G53 lamp base. Easy wiring with transformer, constant-voltage driver or battery, work stable in humid circumstance (including seaside park, coast area, bathing beach, island, ferry ...) and even bad weather, good for landscape lighting, garden lighting, camp lighting, off-grid system, tractor, off-road vehicle and marine/off-shore/ship lighting, etc. (mainly installed in well light, ground light, pool light, spike light, wall washor lamp, uplight, sealed beam, etc., can work without any light fixture)