Jale R.
Google
We started the trail just before sunset around 19:00 in September and did the trail in 45-50 minutes. First half is steep and requires some effort, but views are breathtaking.
The reward at the end are the spring pools, which provide a deserved rest after a day of driving, walking and activities. The pools at the top are the warmest. There are changing stalls, but still you are exposed a bit, but worth the discomfort to soak in the hot water and chill. There were at least 10 people which stayed even when it got dark. At the end we witnessed the northern lights. I can only imagine what the people who stayed past 9 pm would experience - stars and aurora.
Way back with headlights was fine.
This is an experience and activity I would 100% recommend every adventurous traveller in Iceland!