Just cause I'm bored tonight, here's some of mtbr's beam comparisons:
Here's a 13 watt light & motion halogen:


15 watt BLT halogen:


Light & motion 12watt HID:


Niterider 12watt HID:


Turbocat 47 watt halogen:


So for those of you that claim a 12 watt HID is equivalent to a 50+ watt halogen, I hope the above puts things in perspective.