Can vouch for this having heard the theory and tried the "torch at eye-level" method and been able to zero-in on small spiders from a distance of about 5m. It'

Can vouch for this having heard the theory and tried the "torch at eye-level" method and been able to zero-in on small spiders from a distance of about 5m. It's quite amazingly effective, especially the first time, when you're not really convinced.