Six is correct. Saying that, I only have an HID bulb setup in the stock housing. It is def brighter than oem hi beams, but could be much better. It makes the bike def more visible to others, which was my number one concern. I don't run fast at night and rarely outrun my beams.
If I was doing it all over, I would go with LEDs tho. This bike is not an issue, but I have HIDs on my M109 and it draws too much on startup. I have a ton of electrontics on her including about 1500 leds! I was having issues with current draw on initial startup. Had to make some changes for everything to play nice.
Depends on ur desired outcome and minies on hand really. If you want the best lighting get an HID with retrofit lens. If funds are tight, go with an LED or basic HID for now.
Troy