Bolster
Flashlight Enthusiast
Hi--several days ago I requested a number of beam angles, and got feedback that measuring beam diameter on walls & distance from wall was not so easily done. While that's still the preferred method, here's an easier way. I made this "Beam Angle Gauge" which you can download here.
Download and print, and lay your floody lamp at the base, so the sides of the beam run parallel to the lines on the gauge.
So this is an H501 with a known 80 degree beam. You can see the actual beam may be a scootch over 80 but it's pretty close.
This is an old Petzl Tikka with a narrow beam...likely around 30 degrees, as many bare-bulb lamps are.
Angle is easier to see than it is to photograph.
Tips:
* Ignore all the flare at the base of the beam.
* Find the border between light and dark that extends out a good distance.
* If you pivot the light left and right, it's much easier to see where the beam border is.
* Try to get the edge of the beam parallel with the degree lines on the paper. You may have to push the light forward (onto the paper) or pull it back (away from paper) to get parallelism with the degree lines.
Here are the lights I still need an idea of beam angle:
PT Corona
Pixa 1 & 3 (probably nobody has these yet)
PT Apex (flood mode)
Petzl Myo RXP (diffused mode)
Energizer Hard Case Pro (flood mode)
RayOVac Sportsman Xtreme 1-AA (flood mode)
Mamut Lucido TR1
Princeton Remix
Black Diamond Storm
BlackDiamond Sprinter
(...and any other floody light headlamps I may have overlooked. Any light with both spot and flood, I'm only looking for data on the flood or diffused mode.)
Thanks! :wave:
Download and print, and lay your floody lamp at the base, so the sides of the beam run parallel to the lines on the gauge.
So this is an H501 with a known 80 degree beam. You can see the actual beam may be a scootch over 80 but it's pretty close.
This is an old Petzl Tikka with a narrow beam...likely around 30 degrees, as many bare-bulb lamps are.
Angle is easier to see than it is to photograph.
Tips:
* Ignore all the flare at the base of the beam.
* Find the border between light and dark that extends out a good distance.
* If you pivot the light left and right, it's much easier to see where the beam border is.
* Try to get the edge of the beam parallel with the degree lines on the paper. You may have to push the light forward (onto the paper) or pull it back (away from paper) to get parallelism with the degree lines.
Here are the lights I still need an idea of beam angle:
PT Corona
Pixa 1 & 3 (probably nobody has these yet)
PT Apex (flood mode)
Petzl Myo RXP (diffused mode)
Energizer Hard Case Pro (flood mode)
RayOVac Sportsman Xtreme 1-AA (flood mode)
Mamut Lucido TR1
Princeton Remix
Black Diamond Storm
BlackDiamond Sprinter
(...and any other floody light headlamps I may have overlooked. Any light with both spot and flood, I'm only looking for data on the flood or diffused mode.)
Thanks! :wave:
Last edited: