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

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hIKARInoob
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How about using different diffusing sheets that transmit more light; something more transparent?

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hIKARInoob wrote:
How about using different diffusing sheets that transmit more light; something more transparent?

Yep, tried that as well. The clear sheets are what I am using now, they still drop the readings too low unless I go to sheets that do very little diffusing.

Right now I am testing a theory that could increase the readings with no downsides, I should know in a little while if it worked.

hIKARInoob
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Texas_Ace wrote:
The issue is that if I install all 3 diffusing sheets like the 3” spheres to get the readings consistent, then the meter readings are around 33% low. If I remove diffusing sheets to get the numbers up then it becomes less consistent.

I am experimenting now with ways to reduce losses but don’t have very high hopes.

A 4” tube has 33% more circumference than a 3” tube (= 3.14 x D), therefore absorbs 33% more light. This means that your lux meter will show a 33% lower value.
So this makes sense… Or am I saying something obvious?

hIKARInoob
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The primary purpose of the bends in a lumen tube is to diffuse the light. However, you have dedicated diffusers in your tube, so the bends might be redundant? You could perhaps reduce total length of your 4” tube to increase output of your lux meter to equal lumens.

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hIKARInoob wrote:
The primary purpose of the bends in a lumen tube is to diffuse the light. However, you have dedicated diffusers in your tube, so the bends might be redundant? You could perhaps reduce total length of your 4” tube to increase output of your lux meter to equal lumens.

Well, that would actually work, except… this contraption doesn’t use any straight runs of PVC pipe, only fittings. There isn’t really a good place to cut out anything. However, another option might be to replace one of the 90 degree elbows used in this design with a 45 degree elbow.

The Cycle of Goodness: “No one prospers without rendering benefit to others”
- The YKK Philosophy

hIKARInoob
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^^^ So remove a 90 degree bend. Total length to be removed is one third, or 33%.

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hIKARInoob wrote:
Texas_Ace wrote:
The issue is that if I install all 3 diffusing sheets like the 3” spheres to get the readings consistent, then the meter readings are around 33% low. If I remove diffusing sheets to get the numbers up then it becomes less consistent.

I am experimenting now with ways to reduce losses but don’t have very high hopes.

A 4” tube has 33% more circumference than a 3” tube (= 3.14 x D), therefore absorbs 33% more light. This means that your lux meter will show a 33% lower value.
So this makes sense… Or am I saying something obvious?

Yep, you are spot on. The issue with the 3” spheres is getting the readings low enough so I just assumed that it should line up ok (I have to use 4 diffusing sheets to get the readings to the right level on the 3” + some calibrating).

Technically the readings are more like 50-60% lower on the 4” with an equal setup. But the extra surface area of the diffusing sheets could explain that. I just didn’t expect such a large change.

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hIKARInoob wrote:
^^^ So remove a 90 degree bend. Total length to be removed is one third, or 33%.

This is one of the options I am considering, testing showed that it should work. The issue with this option is that it will not stand up with only 2 bends and becomes either a U on the desk or a very award shape that does not balance.

The readings turn out close enough to calibrate though.

hIKARInoob
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Well if you do so you can call it the Texas Ace U-tube. Pretty catchy name! Big Smile

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Texas_Ace wrote:
hIKARInoob wrote:
^^^ So remove a 90 degree bend. Total length to be removed is one third, or 33%.

This is one of the options I am considering, testing showed that it should work. The issue with this option is that it will not stand up with only 2 bends and becomes either a U on the desk or a very award shape that does not balance.

The readings turn out close enough to calibrate though.


Might work with a 45 degree bend in place of one of the 90 degree bends, though. Wink

The Cycle of Goodness: “No one prospers without rendering benefit to others”
- The YKK Philosophy

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Ok, I think we just figured out the issue and the good news is it is semi-easily correctable.

The 4” only has an adapter that steps down to 2”, I need another adapter to step down to 1.5”. This adapter was the issue. After modifying it so it does not shroud the meter as much the readings are right in line with what I expected them to be at the start. I never would of guessed that little bit would make such a large difference.

So now to start building the 4” and hopefully finish those today and start shipping tomorrow.

hIKARInoob
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Sounds good man. Good luck. Thumbs Up Beer

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Great news! It’s good to know it was fixable with a slight mod, and no need to buy more parts (or scrap parts already bought).

The Cycle of Goodness: “No one prospers without rendering benefit to others”
- The YKK Philosophy

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hIKARInoob wrote:
Well if you do so you can call it the Texas Ace U-tube. Pretty catchy name! Big Smile

Best one this month Smile

Micael

Texas_Ace BLF Calibrated Lumen tube

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Ok, Quick update.

After another marathon sphere building session with the whole family helping out we managed to get all the spheres built, calibrated and packed up. Tomorrow I will start the shipping process.

Now to go fall into bed….

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Thanks for all your hard work TA

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Nice going TA!! . Thumbs Up . Beer

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JasonWW
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Wow, ahead of deadline and under budget. Thumbs Up

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And let the Shipping saga begin!

Tracking numbers should start going out via paypal over the course of the day.

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JasonWW wrote:
Wow, ahead of deadline and under budget. Thumbs Up

Within the deadline but I wish it was under budget, more like way over budget in both costs and massively over budget in time. Tired

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Wow, I can’t wait……

Thank you

Thumbs Up

Sorry for my poor english.

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Texas_Ace wrote:
JasonWW wrote:
Wow, ahead of deadline and under budget. Thumbs Up

Within the deadline but I wish it was under budget, more like way over budget in both costs and massively over budget in time. Tired


Lol, I was thinking from consumers point of view. We got it under budget of what it actually cost. Plus I was not expecting it to be done so soon.

From your side of project: way over budget in both costs and massively over budget in time.

Sorry about that. You have many happy customers, though. Beer

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JasonWW wrote:
Texas_Ace wrote:
JasonWW wrote:
Wow, ahead of deadline and under budget. Thumbs Up

Within the deadline but I wish it was under budget, more like way over budget in both costs and massively over budget in time. Tired


Lol, I was thinking from consumers point of view. We got it under budget of what it actually cost. Plus I was not expecting it to be done so soon.

From your side of project: way over budget in both costs and massively over budget in time.

Sorry about that. You have many happy customers, though. Beer

lol, true. I try my hardest to stick to my word whenever possible.

KawiBoy1428
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Got the shipping notice from UPSThumbs Up

Thanks T/A! Beer

KB1428 “Live Life WOT

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Thanks for your hard work i’m sure it will be over my expectation. Next projekt you do…… I’m in/ Micael

Micael

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Newlumen
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Thanks TA. I will cover shipping to WA and NV.,

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Great work thanks TA! I will also cover cost of shipping. Just let me know how much.

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Ok, just got back from the post office / UPS.

All the orders should be shipped now and I think they should all be delivered by Monday except the international orders. If anyone has any issues please let me know.

Please post your lumen results, this is the first time I have had any direct comparisons with my sphere and others, so I am very curious what the results are.

The nice thing is that since they are all calibrated the same, if it is determined that the readings are off one way or the other, we can apply a correction factor equally to everyone. I have zero attachment to the “base calibration” of my sphere being accurate to ANSI specs since I have never had a way to compare it. So if we find a better calibration I am more then happy to adjust. This is simply the best I could do with what I had.

Now to clean up the mess all of this left behind and then start back to work on the mods.

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Texas_Ace wrote:
JasonWW wrote:
Wow, ahead of deadline and under budget. Thumbs Up

Within the deadline but I wish it was under budget, more like way over budget in both costs and massively over budget in time. Tired

When things go this way for me—-I justify it by saying—Education is expensive—Experience is PRICELESS
But being past the middle of 50 I try to limit my Education as much as possible

Texas_Ace
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In other news someone sent me an LT300 lux meter to calibrate with these spheres. I had no idea what the results would be but after calibrating it I was quite happy to see that it lined up surprisingly close to the HS1010A meters I was using.

They were within ~5% across the range of outputs and lights I tested (I had 5 “standard” lights I was using for calibration, the only regulated lights with consistent output I had + an MT03 TA special).

The LT300 did seem less effected by tint and CRI, the warmer and higher CRI tints are where I noticed the highest variance.

I am waiting to see what this person gets results wise in his own testing but I was quite happy with my choice of lux meter seeing as it was 1/10th the price. The LT300 costs more then the whole sphere, even at the new price.

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