Some people think darkness in lucid dreams is caused by their fear of the unknown, or simply because they fell asleep in dark conditions (you sleep with the lights off... right?). Perhaps if you keep the lights on when you attempt to LD, this will carry over to your dream, but I can't promise anything. If you end up in a dark dream, don't give in to your fears and keep thinking something bad will happen.

If you are confronted by a creepy DC, remember that you're in charge. Of course, holding your palm out and telling them to 'go away' won't work 100% of the time, but it will help a lot. You have control over them.

False awakenings will probably occur A LOT to one who takes up lucid dreaming. It's a bit scary, but you have control over the dream. Many of my dreams are in dim or darker lighting, but I've learned to ignore it because I know what I'm doing within the dream.