On Thu, Nov 5, 2009 at 9:07 PM, XeVision <dblumel@xevision.com> wrote:
> LED still has a long way to go to compete with HID as a landing light. This
> is true in terms of total lumens and reach (distance).
>
I'm curious:
a) how many lumens are typical HID landing lights? The newest Cree emitters
can put out 1000 lumens per emitter, and hooking up more than one of these
emitters into a single unit is pretty easy. I have a 900 lumen 2-emitter
bike headlight (from brlights.com), and it is impressively bright, able to
illuminate most of my backyard.
b) besides lumens, what determines reach? I would have thought it would be
a simple combination of the amount of light energy, and the beam shape (aka,
reflector design). Are there other variables involved? Do certain colour
temperatures tend to illuminate further?
Chris
