Texas_Ace BLF Calibrated Lumen tube / Sphere No math skills needed - Several spheres still available

It’s here sitting in my living room, thankfully I have an understanding wife…

Wow!! She is definitely a keeper…… :+1: … :slight_smile:

Yes, there are 3-4 diffusers in the tube actually. They lower the readings on the meter and mostly spread out the light so it is even and beam pattern does not effect the readings. This is a major problem with this design if you do not have the diffusers in place.

The problem is that even a minor change to the ones at the start of the tube can have big effects by the time it hits the meter, which is why it was so hard to calibrate them.

By putting the new one right at the sensor it should have the same effect across all the spheres.

Although naturally I will test several methods when it comes time for that.

Okay thanks for explaining.

Holy cow you cant be serious right? That thing is HUGE!

50cm is about 20 inches. So not huge. I’m sure it’s expensive, though. Plus he’s got all that spectral analysis equipment. I assumed he worked in a lab or something and used their equipment in his off time. :slight_smile:

I heard those sphere cost about $10000…

My 4” light tube wasn’t that far off but I did have to make an adjustment, now its reading pretty much spot on to my stock Surefire and Malkoff lights with known out put. Tested 10 Surefire and 10 Malkoff’s all lights have Constant current drivers and the spec’s are easy enough to check online. The repeatability is amazing

A couple of examples… a Malkoff Hound Dog NW 1000 ansi lumens…

Malkoff Hound Dog CW 1100-1200 ansi lumens

All it took was a piece of Walmart white plastic bag stretched over the light meter :+1:

I tested a few of Randy Brogden’s PFlexPro lights that he tested… pretty much Spot On!

Yes, the repeatability was the key reason I spent 6 months perfecting this design. Without the diffusing sheets the numbers would vary by large amounts even with just a few mm of movement and throwers got a large advantage as well.

Glad to see with minor adjustments the results fall in line, I am thinking that the idea of putting something on the sensor end could be a fairly simple fix for everyone and would be possible for me to ship to everyone without a large expenditure on my end.

I will gladly pay to help defray what ever cost you may incur to deliver a fix that makes all the tubes more accurate and consistent with each other

I will most likely take you up on that. When I get to a point of having a fix figured out feel free to message me. It will most likely be a few weeks so I will have lost this post by then I am sure lol.

:+1:

hi kiwi, can you tell us what adjustment do you make on your 4” tube ? Thanks.

What is the red indictator by the tube?? What does it do?

It’s his lighted mouse wheel

Thanks… kiwi is bitter !

He stretched a white plastic bag from a local store over the sensor. Very similar to what I did using some wax tissue paper.

I put brand new batteries in the Meter ( I have had low/crappy batteries give me High Lux readings before) and after many hours of trying different materials ……I tried the Walmart white plastic bag…. 1 layer stretched over meter shoved into the end of the tube :smiley:

Just curious, is the hole in the centering ring just perfectly sized for this light so only the very edge of the bezel is resting on it? (not blocking any of the reflector area)

I thought we had to hold the light through the hole, starting at roughly flush then move it up and down.

In most cases you have to hold it but some lights will rest on it. If you hold the ring up to the light you can see if it will block any of the reflector easily. If not then you can simply rest it on top of the ring.

It completely depends on the light you are using.

It is all pretty intuitive once you get it I think.