Princeton Tec's Shockwave primary light has long been an industry leader. Now, Princeton Tec turns the light up a notch with LED technology. Three 3-watt Luxeon LEDs deliver a total of 9 watts of lighting power, powered by eight C-cell alkaline batteries. Two levels of intensity give you complete control between maximum brightness (12 hour burn time) and increased battery life (20+ hour burn time). Besides delivering unprecented brightness and color temperature for realistic colors underwater, Princeton's LEDs can burn for over 10,000 hours without replacement. All this, plus an impact resistant, rugged shell rated to 330 feet (100 meters) Make this the light of choice for many.