Star light star bright, first star I see tonight, I wish I may I wish I might, have the wish I wish tonight.
That's how the poem goes and as much as you wish,and no matter how bright the stars are you'll need some type of lighting. Working on something in low or no light conditions especially during an emergency with a candle just won't cut it, especially if fuel or flammable surroundings are involved.
The skies the limit when it comes to the different styles of light's and types of batteries their powered by. For years I carried a Mini Mag light with an incandescent bulb, it was more than adequate for the type of work I did. Another good attribute the Maglight had was that it used common AA batteries and a spare bulb is located in the tail cap in case the bulb fails or breaks. Now days I carry an LED type light with multiple brightness levels and a strobe function. Another good attribute is a clip that is reversible so that it can attach to the brim of my hat as a hands free work light.
One night I was headed home from work at about 12:30 AM I came upon a truck on it's side off the road and in an old mill raceway. Out came my Mini mag light and I headed for it to check on the occupants. As I headed for the vehicle I was relieved that the driver was not injured, she was just to short to get the door open as it was on it's side.
Along with my Multitool and knife I always have my light with me ready to go. And remember to have spare batteries and or a spare light close at hand, you never know when the need will arise.