Oct 4, 2005 #1 N Nell Enlightened Joined Dec 26, 2004 Messages 220 Lately I have noticed a number of lights coming with a lens that looks like a magnifier lens. Especially in some Dorcy lamps. What does this lens do that a clear lens will not. The beams appear to be very round and concentrated without much spill.
Lately I have noticed a number of lights coming with a lens that looks like a magnifier lens. Especially in some Dorcy lamps. What does this lens do that a clear lens will not. The beams appear to be very round and concentrated without much spill.
Oct 4, 2005 #2 M Mike Painter Flashlight Enthusiast Joined Sep 16, 2002 Messages 1,863 Nell said: The beams appear to be very round and concentrated without much spill. Click to expand... You have described what they do. Overall light output will be slightly reduced but the remainder will be concentrated into a smaller area. That usually will be an advantage. I expect that sooner or later they will rediscover the fresnel lens and find a cheap and reliable way to move it. Less loss and focusable.
Nell said: The beams appear to be very round and concentrated without much spill. Click to expand... You have described what they do. Overall light output will be slightly reduced but the remainder will be concentrated into a smaller area. That usually will be an advantage. I expect that sooner or later they will rediscover the fresnel lens and find a cheap and reliable way to move it. Less loss and focusable.
