One of my 400w Ushios will not start anymore and I've just purchased a replacement from Marine Depot. The one that will not start is only 3 months old and there is a fragmented piece of glass that appears to have burned off within the bulb itself. Marine depot has not yet responded to my warranty inquiry and they did charge me for the replacement. Does anyone know if there is a warranty for these bulbs? Do I need to go directly to Ushio?