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 [I] 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.