Wuzzat?
Well-Known Member
- Joined
- Jan 20, 2010
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I need one to read street signs from my car, so I'd need a 12v (or less) light and I want 300 lux at 10 meters distance.
Here's a list of HD lights
Lumens, distance
212 . . . .186
61 . . . .82
208 . . . .126
125 . . . .53
111 . . . .47
134 . . . .388
450 . . . .400
I assume the distance given [the beam throw] is when the beam illumination falls to 1 lux [E], the light of a full moon.
Unfortunately, they do not give beam angle, which ties this all together.
But, it may not be necessary.
For 1 lux, the beam candlepower is the distance [R] squared, so the third column is calculated based on the distance.
Lumens distance calc'd beam candlepower
212 . . . . .186 ........34596
61 . . . . .82 . . . .6724
208 . . . . .126 ........15876
125 . . . . .53 . . . .2809
111 . . . . .47 . . . .2209
134 . . . . .388 ........150544
450 . . . . .400 ........160000
Now, I want 300 lux for reading the sign and I = E * [R^2] and so at 10 meters I need 30,000 beam candlepower.
The first and last two lights should work. This last one is a Maglite that can be focussed from flood to spot.
Here's a list of HD lights
Lumens, distance
212 . . . .186
61 . . . .82
208 . . . .126
125 . . . .53
111 . . . .47
134 . . . .388
450 . . . .400
I assume the distance given [the beam throw] is when the beam illumination falls to 1 lux [E], the light of a full moon.
Unfortunately, they do not give beam angle, which ties this all together.
But, it may not be necessary.
For 1 lux, the beam candlepower is the distance [R] squared, so the third column is calculated based on the distance.
Lumens distance calc'd beam candlepower
212 . . . . .186 ........34596
61 . . . . .82 . . . .6724
208 . . . . .126 ........15876
125 . . . . .53 . . . .2809
111 . . . . .47 . . . .2209
134 . . . . .388 ........150544
450 . . . . .400 ........160000
Now, I want 300 lux for reading the sign and I = E * [R^2] and so at 10 meters I need 30,000 beam candlepower.
The first and last two lights should work. This last one is a Maglite that can be focussed from flood to spot.
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