Whilst doing any sport in the dark, if that be running, cycling, hiking, climbing or horseback riding, it’s important for you to see and to be seen. Wearing or holding a bright enough headlamp or torch is imperative to be seen. 50 lumens would be seen as adequate for running in the dark along a street, however running in a forest, you may need up to 100 lumens to be seen. You need a bright enough headlamp to be seen.
Is there a sport where I should be wary of how bright my light shines?
Yes, in any sport you should be wary too much light shining towards other people as this can cause safety and health problems such as “glare” headaches and stress. For example, when running towards oncoming
traffic at night, you don’t wish to cause a glare for any oncoming drivers. This could make them swerve and hit you as a runner. Alternatively, this could cause the driver to get a headache or eye strain.