After a weekend of diving caves with visibility on average of only 20 feet, we compared the HID 1000 and LED 700. To our surprise the LED 700 was more effective in the low visibility situations. Apparently the LED throws more light out close to the source. This is a great benefit in low visibility situations. It was bright with no backscatter from the lower visibility conditions.
The HID 1000 is better in the clear waters where its focal length punches thru. We compared the two a few weekends before in some deep caves with large rooms. I guess the best light is dependent on diving conditions. I have both so I will pick and chose based on the dive plan.