Join Date: Sep 2014
Location: Williams, Arizona
• Horses: 0
The pupils of our eyes contract to prevent too much light from entering our eyes. Pupils do not contract with red light. A person can go blind looking directly at railroad red lights. Ships below deck, do or did, use soft red lights since going from an area lighted with red light and into total darkness required no adjustment from the pupils.
I often use the red light setting on my head lamp since I can look off into the darkness at the side and my pupils are already adjusted.
So it may just be that the infra red of the heat lamps do the same damage over time if they are used a lot.