Bicycle Lights

As I was riding to work this morning, about 6:30 while it was still dark, I saw ahead of me the faint silhouette of a bicyclist crossing 3 lanes.  WOW.  They had no lights.  This was an area where cars speed by at 50 mph.
I have added lights over the years, first to be seen, then to be able to see the road ahead of me.
I now have a red rechargeable blinking light on the back of my helmet, and a rechargeable light on the top of my helmet strong enough to light up the road ahead of me.  I also have lights on the front, varying from two to three, battery powered,  And one light on the back of my seat, a red blinker, battery powered.
When I just had a single light for the rear, I did find at least once that the battery had died and I had ridden home with no shining light to warn people behind me.