DEAR BARBAGRIS

[1olbull]

@barbagris
No area - the meter will measure a ray of light falling on it. That is why the complex formula for converting lumens (luminous flux) to lux (illuminance) requires area in square meters, spherical radius in meters or surface area in meters squared with the constant of 10.764 to break it all down to a ray.
Googlefu "lumens to lux calculator".

 

[barbagris]

@barbagris
No area - the meter will measure a ray of light falling on it. That is why the complex formula for converting lumens (luminous flux) to lux (illuminance) requires area in square meters, spherical radius in meters or surface area in meters squared with the constant of 10.764 to break it all down to a ray.
Googlefu "lumens to lux calculator".

Yes I know - what I wanted to express was the BEAM pattern coverage at 1M. Circle, oval, weird and square metre of said pattern at 1M.

 

[1olbull]

Yes I know - what I wanted to express was the BEAM pattern coverage at 1M. Circle, oval, weird and square metre of said pattern at 1M.

Me thinks it would be very difficult to determine a pattern at only 1 meter distance and at what lux number pattern would one go for?
I measure center beam at 1 meter in order to check against factory boasts and my actual lux measurements at greater distances with the inverse square formula.
I usually start at 50 feet then 100, 150, 200, 250 and 300 feet. Laterally I generally need + or - 30 feet to define the patter.
I measure at three heights - ground level (feet), 24 inches (knees) and 39 inches (waist). I use foot candles when measuring in feet, lux when in meters.
An example of my Daymaker measurements, which exceeded the 250 foot limitation of my parking lot.

 

[barbagris]

I measure center beam at 1 meter in order to check against factory boasts

Aha - What I was getting at is measuring the LUX at 1M in various parts of the beam. Sort of like shining onto a card with grids and measuring each grid - make more sense? - I was looking on Amazon and there are some cheap (and I mean cheap) incident-meters. Whilst not professional-whitness worthy - will allow me a more numeric beam distribution analysis.

I wish I had the space you do. Was that Daymaker DIP or MAIN? - Can't wait to see the Adaptive Chart.

A question - How high is a typical American Deer's eye? - I have a theory worm-holing through my synaptic core.
We may need Mr-electrickery @DEcosse at some stage too. And some GOOD strong UV LEDs.

 

[1olbull]

I have three incident meters.
The best is a ILT 1400 ($3200)
My favorite is a Konica/Minolta T-10MA ($800 used)
My Extech 300 is also adequate but not NIST calibrated ($I forget but not expensive)
I would recommend Extech if ya want a decent less spendy meter.

 

[barbagris]

My Extech 300 is also adequate but not NIST calibrated ($I forget but not expensive)
I would recommend Extech if ya want a decent less spendy meter.

For now I am thinking more a €20 meter. But will see how I get on.

 

[1olbull]

For now I am thinking more a €20 meter. But will see how I get on.

Izzat a Rusky symbol?

 

[Rocket Scientist]

I have two real good light meters mounted in my head. They are all I need to tell if my headlights are any good.

 

[TURBO200R4]

I have two real good light meters mounted in my head. They are all I need to tell if my headlights are any good.

i have those same meters but u might want to reset them after dear hunting is over

 

[Rocket Scientist]

i have those same meters but u might want to reset them after dear hunting is over

I walked right into that one