WTS: Calibration lights for DIY integrating spheres / lumen tubes - 67 € -

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maukka
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Since the lux meter is probably not filtered perfectly I would use different correction factors for different types of lights. Check out djozz’s great lux meter tests for more info. Test1, test2, test3, test4, test5.

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peabody wrote:
Here we go with the math again.(Steel’s lights)I took Maukkas readings at 30 sec. So we got 35 and 34.1 which is somewhere around .972. (so if 40 is the reading-38.88) And we got 98 and 94.5 which is somewhere around .965. (so if the reading is 485-468.02) Now, since we have a difference should we average the .972 and .965? ( .968.5 ) We get up into the higher numbers with the S2 and the number goes smaller ,say .945 do we just average all numbers or just the two calibrated lights we have? Sorry to be so dumb about this. Math is not my forte’.

The difference is mostly due to the tint of LED I am guessing.

These cheap meters are effected by the tint of the LED. Meters that are not biased would cost as much as the whole sphere.

There is not much that can be done to correct for the tint bias sadly outside of buying a $100++ lux meter.

Texas_Ace
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maukka wrote:
Since the lux meter is probably not filtered perfectly I would use different correction factors for different types of lights. Check out djozz’s great lux meter tests for more info. Test1, test2, test3, test4, test5.

Yep, I agree. I know for a fact that these meters (and every other meter I have tried in the sub $100 price range) are biased to cooler tints.

djozz
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Texas_Ace wrote:
maukka wrote:
Since the lux meter is probably not filtered perfectly I would use different correction factors for different types of lights. Check out djozz’s great lux meter tests for more info. Test1, test2, test3, test4, test5.

Yep, I agree. I know for a fact that these meters (and every other meter I have tried in the sub $100 price range) are biased to cooler tints.


I just yesterday found out that my most used integrating sphere warms up the spectrum by a few hundred K, maybe I should use a cheaper luxmeter to compensate for that Party
JasonWW
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peabody wrote:
Here we go with the math again.(Steel’s lights)I took Maukkas readings at 30 sec.
So we got 35 and 34.1 which is somewhere around .972. (so if 40 is the reading-38.88)
And we got 98 and 94.5 which is somewhere around .965. (so if the reading is 485-468.02)
Now, since we have a difference should we average the .972 and .965? ( .968.5 )
We get up into the higher numbers with the S2 and the number goes smaller ,say .945 do we just average all numbers or just the two calibrated lights we have?
Sorry to be so dumb about this. Math is not my forte’.

I would not do any math. It’s not about super accuracy. I would use the number right off the meter for NW lights.

For CW I would just bump it down about 3% worth. So a cool white light measuring 1000 lm would be 970, etc… Easy peasy.

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djozz
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I have a new Extech LT45 luxmeter (to be tested together with some other new luxmeters) that because of the imperfect spectrum sensitivity has pre-sets for different light tints, which is about the same what you suggest here. Smile

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Smooth surface, face to face
Grooves are outward

Scotch tape fixed on both sides
Minor reduction of light

Put into the tube

Leave some gap between the illuminometer and the tube

Fully charged battery eneloop AAA
I get perfect data

BLF 348

Olight i3E EOS

Sorry for my poor english.

JasonWW
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I can see a lot of light escaping.

Maybe those small lights need a tighter fitting centering ring?

Texas Ace Lumen Tube and JoshK Sphere calibrated with Maukka lights

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Geuzzz
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JasonWW wrote:
I can see a lot of light escaping.

Maybe those small lights need a tighter fitting centering ring?

Not if it’s calibrated correct right now. Don’t touch anything, just enjoy Beer

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Geuzzz wrote:
JasonWW wrote:
I can see a lot of light escaping.

Maybe those small lights need a tighter fitting centering ring?

Not if it’s calibrated correct right now. Don’t touch anything, just enjoy Beer


I disagree. Plus I don’t think it’s calibrated. If keeping the leaking light in the tube makes the readings go up, then it’s reading high.

In my opinion, the fit around the light should be a bit tighter (although it doesn’t always seem to make that big of a change) and the lux meter needs to be pushed all the way in. This is how you will get consistent results with other lights.

Texas Ace Lumen Tube and JoshK Sphere calibrated with Maukka lights

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steel_1024
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First test:LuminTop ODF30
moon: 11
Low:191
Med:682
High:2140
Turbo:4270

ODF30 Now
moon: 4
Low:124
Med:447
High:1423
Turbo:2850

Standard flashlight test light escaping too much?

Sorry for my poor english.

djozz
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JasonWW wrote:
Geuzzz wrote:
JasonWW wrote:
I can see a lot of light escaping.

Maybe those small lights need a tighter fitting centering ring?

Not if it’s calibrated correct right now. Don’t touch anything, just enjoy Beer


I disagree. Plus I don’t think it’s calibrated. If keeping the leaking light in the tube makes the readings go up, then it’s reading high.

In my opinion, the fit around the light should be a bit tighter (although it doesn’t always seem to make that big of a change) and the lux meter needs to be pushed all the way in. This is how you will get consistent results with other lights.


Light escaping is not a problem by itself, consistency is when the escaping light is the same fraction for all lights.
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djozz wrote:
JasonWW wrote:
Geuzzz wrote:
JasonWW wrote:
I can see a lot of light escaping.

Maybe those small lights need a tighter fitting centering ring?

Not if it’s calibrated correct right now. Don’t touch anything, just enjoy Beer


I disagree. Plus I don’t think it’s calibrated. If keeping the leaking light in the tube makes the readings go up, then it’s reading high.

In my opinion, the fit around the light should be a bit tighter (although it doesn’t always seem to make that big of a change) and the lux meter needs to be pushed all the way in. This is how you will get consistent results with other lights.


Light escaping is not a problem by itself, consistency is when the escaping light is the same fraction for all lights.

Exactly my point.

Texas Ace Lumen Tube and JoshK Sphere calibrated with Maukka lights

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Texas_Ace
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I just tested with my own BLF348 and it read 1 lumen higher with a custom centering ring vs the smallest normal ring.

JasonWW
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Texas_Ace wrote:
I just tested with my own BLF348 and it read 1 lumen higher with a custom centering ring vs the smallest normal ring.

And what about with your lux meter slightly pulled out?

Texas Ace Lumen Tube and JoshK Sphere calibrated with Maukka lights

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Texas_Ace
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JasonWW wrote:
Texas_Ace wrote:
I just tested with my own BLF348 and it read 1 lumen higher with a custom centering ring vs the smallest normal ring.
And what about with your lux meter slightly pulled out?

The meter position will be relative, it will effect all the readings by a fixed percentage. It basically becomes part of the calibration.

That said I do not recommend using the meter position as part of the calibration as it is too hard to keep it consistent over the long term.

Adding a little electrical tape to the inside of the 1st bend would be a better way to fine tune the readings since that will not be effected by bumping the sphere.

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Texas_Ace wrote:

That said I do not recommend using the meter position as part of the calibration as it is too hard to keep it consistent over the long term.

That was the point I was trying to make earlier. It’s best to put the meter all the way in so that it’s consistent and then find some other way to adjust the output up or down to get the correct Lumen reading straight from the meter.

Also, the vast majority of my lights have a fairly decent fit through the centering ring holes. If I were going to be using those extra small diameter lights to do the calibration, I would probably rig up something simple to prevent that extra light from getting out.

Sorry if I sounded grumpy.

Texas Ace Lumen Tube and JoshK Sphere calibrated with Maukka lights

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Newlumen
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steel_1024 wrote:
First test:LuminTop ODF30
moon: 11
Low:191
Med:682
High:2140
Turbo:4270

ODF30 Now
moon: 4
Low:124
Med:447
High:1423
Turbo:2850

Standard flashlight test light escaping too much?

Thats about right.. i got 3150 lumen @ turn on.. and 3090 lumen.. odf30 is a joke.. sometimes turbo mode doesnt want to work… lumintop should have use spring tailcap.. oh well..

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Newlumen wrote:
steel_1024 wrote:
First test:LuminTop ODF30
moon: 11
Low:191
Med:682
High:2140
Turbo:4270

ODF30 Now
moon: 4
Low:124
Med:447
High:1423
Turbo:2850

Standard flashlight test light escaping too much?

Thats about right.. i got 3150 lumen @ turn on.. and 3090 lumen.. odf30 is a joke.. sometimes turbo mode doesnt want to work… lumintop should have use spring tailcap.. oh well..


I think it’s a pretty good light.

The tail cap lacks springyness. Just pull the tab up a little so the battery gets compressed. Then you should get turbo for about 1m30s or more. I might replace that tab for a regular spring and bypass it.

I got about 3050 lumen at 30s.

I don’t use it because it lacks a mode around 1000 lm and has the weird one click on and press/hold off. Also, I don’t like glued lights.

I can’t seem to find any 26650 boost driver light that meets my needs. I’m just waiting for Lexel to start selling his drivers.

Texas Ace Lumen Tube and JoshK Sphere calibrated with Maukka lights

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vestureofblood
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My lights came today. I will give a report once I have some time to play. Thanks again Maukka

In Him (Jesus Christ) was life; and the life was the light of men. And the light shineth in darkness; and the darkness comprehended it not.
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maukka
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More lights arrived today. All the people on the list will have their sets sent out this week.

yasenf
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I also got my lights – very happy, thanks Maukka!

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PPal sent! Thank you very much!

Terry Oregon
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What carrier is delivering these in the U.S.  ?

My reviews: , My personal collection of lights LINK,  J5 Tactical V1 Pro review LINK,  Thirteen Optical Sensors review LINKZebralight SC700d review LINK,  Ray-O-Vac Super Power Sportsman review LINK,  Convoy S2+ color combos LINK,  How To flash D4V2 LINK,  Convoy S21A LINK

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Not that it matters but VoB got his his really quick. Probably paid extra for the shipping. As far as who is delivering them in the states I have no clue. I would think usps will eventually end up delivering them.
They will get here when they get here.

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I have been rushing to the mailbox everyday after work, nothing yet. I usually don’t to get excited about new lights but these, I feel like a 10 year old at Christmas. Big Smile

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Got mine via USPS today. Thanks! Can’t wait to get calibrating. Thanks maukka!

For those who are antsy (I was), it wasn’t in my informed delivery app, just showed up.

Terry Oregon
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Quote:
Got mine via USPS today.

 

Thanks, that tells me I don't need to check the front of my house for packages after USPS has delivered the regular mail.

My reviews: , My personal collection of lights LINK,  J5 Tactical V1 Pro review LINK,  Thirteen Optical Sensors review LINKZebralight SC700d review LINK,  Ray-O-Vac Super Power Sportsman review LINK,  Convoy S2+ color combos LINK,  How To flash D4V2 LINK,  Convoy S21A LINK

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It fit in the mailbox easily. And I’ve got a regular sized mailbox.

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Those who received calibrate lights should post lumen. Thanks

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