What Don said above is absolutely true and correct.  I hope I will not offend him by adding a less costly version for you.  I live in an area that does not have street lights. But in my former home town where i started running when I was fourteen some 33 years ago, the did have street lights and I ran at night all the time. I recently was looking for batteries and came upon headlamps that were advertised for hiking.  But I bought my first one and it was not powerful enough.  I then purchased my current one, from Walmart.  It is a Energizer 3 LED Headlamp  and it is extremely bright.  It is a LED and gives off white blue light.  The batteries last on FLOOD Lamp mode for over 50 hours and the price is around $25.00.

The SPOT LIGHT mode takes the most energy. The FLOOD LAMP mode that I used is extremely bright, and is the mode that you get the maximum amount of hours between battery changes.

Don's version is nice because you can recharge it and may be the best one for you. But you find that a less expensive one will work for you...

I find it nice to have options. No Kidding, I have learn so much from Don and all the other posters to this Active Community....

Hope  you all have a good run.....and can find a good headlamp to light your way....