Giesemann Megacrome XDE (double ended) 12500K 250 Watt Metal Halide Lamp.

MegaChrome Marine 12.5K 
This lamp is specifically designed for marine aquaria 
that demand a very high light intensity simulating natural 
sunlight within the first 5ft of water. 
Its special light spectrum has less red and more blue 
to enhance the brilliant and fluorescent colors of your 
fish and corals. 
Compared with similar Kelvin rated bulbs, the Mega- 
Chrome Marine lamps have a significantly higher lumen and 
PAR output and color stability in excess of 3000 hours. 
• High Lumen and PAR output 
• Incredible color stability up to 3000 hours 
• Can be supplemented by additional actinic lighting 
• Promotes good coral growth 
• Creates a natural ‘ripple/glitter’ effect in the aquarium