Hi Shelagh. Here are some things to consider.
1. If your fear is more about tripping, running with a club will do nothing to change that (other than someone will be there to pick you up).
2. Walkers are attacked because they often have handbags / cash / credit cards / expensive phones / jewellery. For all intents and purposes, runners have nothing. OK, so we might have a Garmin worth a bob or two but nothing that a druggie can sell quickly down the pub. And, let's face it, that's what most muggings / attacks are about.
3. Whilst industrial estates can seem a bit creepy, they're actually not bad places to run (I know as I have and still do run on them). Traffic is less than out on the roads. Most have 24 hour CCTV. Most have security driving around checking premises. Many are used for overnight stops by lorry drivers so, although you might not see them, there are probably quite a lot of people around.
4. If you can only see clearly under a reduced number of street lights, then others can see you a reduced number of times, too, so you're probably at less risk of being noticed (unless you believe that a mugger is lurking under a light waiting for you to go past, in which case, the lit areas are the most dangerouis!!).
Please don't think I'm trying to be a smart arse by saying these things because I'm not. I'm trying to put your worries into perspective so that, hopefully, they won't continue to be reasons for you to fear going for a run.
One thing to make sure of.....never run consistently on the same route because that really can put you at more risk. Just be smart, don't run with ear phones in at night and always let someone know where you're going and when you expect to be back. Running at night really is no more dangerous than running in the day......it just 'feels' worse. And believe me, there is nothing more spooky than running down a dark country lane, miles from anyone and suddenly you hear a sheep cough!!!!!!! Even my own sheep spook me sometimes when i go down our field to get the horses in at night.......and that's on my own land!! lol