My favourite kind (now) are the Leight Laser Lites - got introduced to them whilst working at a place with a datacentre and was soon borrowing* several pairs ev

My favourite kind (now) are the Leight Laser Lites - got introduced to them whilst working at a place with a datacentre and was soon borrowing* several pairs every time I went down to the basement. Cheap in bulk, which is handy because I need them to sleep.