Handmade for quality assurance, every Sunpaq lamp is handcrafted with durable 2mm glass tubes, hand-blown and pressurized with pure argon to create the perfect environment for energizing the lamp phosphors. High quality Philips lamp filament provides the right amount of kick to fire the lamp and maintain high lumen output. 18-K gold plated pins ensure excellent conductivity and reduce failure due to corrosion. Rigorous testing, which includes a 10 hour burn-in process for each lamp, ensures quality and performance all the way to your aquarium. Dual phosphor technology makes the Sunpaq lamps a brilliant choice when it comes to compact lighting. Using a proprietary blend of phosphors from Nichia, the world's leading phosphor manufacturer, Sunpaqs produce eye-popping colors and superior lumen maintenance.