(Time to sign up for some races with larger fields now, eh?)

And this course, fast flowing? (Although anything that's not the Nats course is fast flowing to me).

You could probably squeak by with that little light but it certainly wouldnt be conducive to trying to do well on a course you don't have memorized.  You need to be able to see stuff pretty far out on front of you, especially on fast downhills.  You should look to have closer to 1500-2000 lumens. and as you can imagine, not all lumens are equal.  There are other considerations, like beam pattern and light frequency.  There are some good pieces on MTBR.com about lighting.   My personal preference is to have a pretty wide beam on my bars pointed at where the bike is headed and a little narrower beam on my helmet which will point where I look.  Also I always have one decent back-up light on me.  Even in short night races like this. crap seems to happen to lighting (e.g, batteries die, connections fray, lights get knocked off and lost in the woods).  (I've twice scrapped my chances of doing well at this race by riding other people out of the woods whose lights had died for one reason or another.)  Also have a light handy that you can use if if you have to fix a flat or do other repair work.

Again, it sounds lie there may be some changes this year, but the general terrain at 909 is not as fast smooth and flowing as say Morristown or Stewart, but it is presumably far less technical than what the Pennsylvania Nationals course sounded like. 

I'd be comfy with 6-700 lumens on my head. Bar lights are secondary. 

Likewise. Were you able to find your way through the good stuff at Stewart without the course markers up? 

I ended up having a great ride at Lewis Morris yesterday with my puppy tagging along.

For all you crossers who've been at it for at least 5 years, coincidentally the fields that my son's soccer tournament was at yesterday were built, in part, on top of the venue for the Central Park 'cross races that Marty's and Westwood sponsored in Morris Plains in 2010 and/or 2011.   When I got there I felt strong sense of having been there before... in a dream perhaps...and then it hit me.  If you haven't been there, it's a lovely suburban park with all of the amenities, in the middle of which sits an empty 19th century "lunatic asylum" known as "Greystone."