---In Indoor_Construction@yahoogroups.com, <indoor_construction@yahoogroups.com> wrote:
On 24-Sep-13 15:46,
rbharlan@... wrote:
>
> You should hunt for a "million candlepower" searchlight. I have a 10
> million candle power light that the US team has used in the last few
> WcH's in the mine. LEDs are too weak for this application.
>
How wide is the light beam for the searchlight? For a 50 degree beam,
you would need about 5000 lumens to match 10 million millicandelas. But
if the beam was 125 degrees wide (as for led lights), the you would
need 31k lumens! Quite a difference!
-Tapio-