These days it's easy and fairly inexpensive to equip your bike with lights (both headlight and tail light) that are at least as bright as regular car lights and will make you stand out better at night than you do during the daytime. The only time I'm concerned about night riding is when it's around the time that the bars close and their patrons hit the streets (especially in areas where neighboring towns have different closing times and you get mass migrations).

I haven't seen that particular Cateye light in use, but based on the 7 hr runtime on highest setting with 2 AA cells indicates to me that it is only about a 1W light compared to many that have 10x or more power. If it doesn't give you enough light to feel secure there are lots of brighter ones. And don't neglect your tail light - I recommend using two since one could fail unexpectedly and you might not even notice immediately.