On Sat, Oct 19, 2013 at 6:46 PM, Tapio Linkosalo <Tapio.Linkosalo_at_iki.fi> wrote:
> Joking aside, I'd also love to get some suggestions for the torchlight
> required/sufficient for flying in the salt mine... There is a number of
> relatively cheap lamps using Cree LM T6 LED lamp, these give out up to 1000
> lumens, and in a comparison to car headlights, the light spot is about as
> bright as one from H4 car light, but the beam is narrower ( e.g.
> http://dx.com/p/ultrafire-sh-3aa-cree-xm-l-t6-800lm-5-mode-memory-white-led-flashlight-w-strap-3-x-aa-1-x-26650-124061
> ). Then, if that does not suffice, there are lamps with 3 or even 5 of such
> elements, raising the lighting power to 2500 or even 4000 lumens. But, how
> much is enough?
Could someone please give some information on how much light is needed
in the mine?
For reference, I heard that off-road endurance motorcyclists use 900
lumen headlamps when they drive in the dark; sufficient when the track
is straight but for open fields, where the track is winding, a wider
(and therefore more powerful?) beam is needed.
On the other hand, a friend-of-a-friend has a 3,500 lumen light, but
does not want to borrow it, as he is worried about the (temporary)
blindness that the light can cause if shined to someone's eyes... I
have never heard of such problems in the mine, therefore I gather that
maybe a torch with a single T6 LED (at around 900 lumens) would
suffice for the mine?
-Tapio-
Received on Fri Nov 01 2013 - 02:26:21 CET