Rule of thumb - Watt for Watt, HID outputs 3 times that of Incandescent. 100 Watt HID system would equal 300 Watt Incan. However, many "100 Watt ballasts" output 80 to 85 Watts so real world comparison is closer to 100 Watt HID system = about 250 Watt Incan. Still more than the 170 watt Incan bulb. Yes, there are some of these or similar large spotlights that have been modded with 100 Watt systems.