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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 27 Nov 2017 (Monday) 21:23
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Results of Flash Duration Measurements on My Various Strobes

 
williaty
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Post edited 6 months ago by williaty. (2 edits in all)
     
Nov 27, 2017 21:23 |  #1

I got a flash duration meter this year and I figured since I already took the time to collect this data you guys might want to see it too. Note that I have a graph of all my flash units compared to each other but all the plots of individual flash pops are from the Flashpoint Xplor 600 TTL because I wasn't clever enough to think of screenshotting the flash duration meter display until then.

The units under test are:

1) Norman P2000D which is a 2kJ pack+head system. I have the dual-tube head, so I can go up to 4kJ. That's 4000 Watt-seconds, for those of you that don't speak SI or the equivalent of 20 of the Flashpoint Evolv 200/Godox AD200 speedbricks.

2) Norman P800D 800J pack+head system

3 and 4) Paul C Buff Einstein E640 in both Color and Action modes

5) Flashpoint Xplor 600 TTL

That's all the flash systems I own. If anyone wants to show up in Central Ohio with their flash units, I'll test them as well and add the data to the plot and post.

First up is the combined plot of all the things I tested. The vertical axis is time in seconds and the horizontal axis is the electrical input power (in Joules, aka Watt-seconds) on a log base 2 scale (otherwise the low power end of the graph just bunched up silly). Most interesting thing to me is how clear it is which units use IGBT technology and which don't.

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It's interesting to me how the Xplor 600 keeps up pretty well with the Einstein in terms of duration. Of course, if I tested consistency of output and color constancy across the power range, the Xplor wouldn't look as good.


Also, I have graphs of the light output over time for the Xplor 600 at 1-stop power intervals.

IMAGE: https://i.imgur.com/DGqRx2k.png

IMAGE: https://i.imgur.com/JoDRZ3E.png

IMAGE: https://i.imgur.com/oUW5cyi.png

IMAGE: https://i.imgur.com/0owRBYa.png

IMAGE: https://i.imgur.com/bRVe4Bv.png

IMAGE: https://i.imgur.com/sg1tZBp.png

IMAGE: https://i.imgur.com/3gwMJtq.png


IMAGE: https://i.imgur.com/zO​3NBfP.png

Finally, here's the measurement data in case you want to see it:

Flash durations

Norman LH4000

P2000D pack
4kJ summed 1/220
3.2kJ summed 1/220
2.4kJ summed 1/240
1.2kJ same bank 1/400
800J same bank 1/530
800J small bank 1/560
400J small bank 1/920

P800D pack
800J summed 1/600
400J summed 1/220
800J split 1/610
400J split 1/220
400J right 1/830
200J right 1/220
400J left 1/840
200J left 1/220

Einstein Color mode
0 1/600
-1 1/1050
-2 1/1750
-3 1/2300
-4 1/2300
-5 1/3300
-6 1/3600
-7 1/4500
-8 1/5300

Einstein Action mode
0 1/500
-1 1/1650
-2 1/3400
-3 1/5300
-4 1/7700
-5 1/8000
-6 1/8200
-7 1/8600
-8 1/9000

AB400
Full 1/910
1/2 1/840
1/4 1/550
1/8 1/610
1/16 1/590
1/32 1/550

Flashpoint Xplor 600
Full 1/250
-1 1/2 1/800
-2 1/4 1/1600
-3 1/8 1/2700
-4 1/16 1/4100
-5 1/32 1/5400
-6 1/64 1/6000
-7 1/128 1/8200
-8 1/256 1/8800



  
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Wilt
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Nov 28, 2017 01:46 |  #2

Interesting to see your measurements, vs. what Buff claims for the Einstein...

Flash Duration (t.1) - in Action Mode or in Color mode: 1/588 sec. (at full power)


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OceanRipple*
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Post edited 6 months ago by OceanRipple*.
     
Nov 28, 2017 05:25 |  #3

Tx for sharing your findings.

. . a link to another thread that included similar info on the Jinbei HD600v / early Rovelight 600B and a 580ExII Speedlite (and, indirectly, other flashes too):
https://photography-on-the.net …showthread.php?​p=17694712




  
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dmward
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Nov 28, 2017 08:24 |  #4

Wilt wrote in post #18505657 (external link)
Interesting to see your measurements, vs. what Buff claims for the Einstein...

Flash Duration (t.1) - in Action Mode or in Color mode: 1/588 sec. (at full power)

It requires a lot more information to determine the relative accuracy of the Buff result and the OP's result.

Would be useful to know which measuring device the OP is using.

Sekonic apparently has the capability built into some of its newer flash meters to read out duration.

The graphs offered by OP suggest something a bit more sophisticated.

Its useful information on a relative basis not sure how to evaluate it on an empirical basis without knowing a lot more about measuring device and method.


David | Sharing my Insights, Knowledge & Experience (external link) | dmwfotos website (external link)

  
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Wilt
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Post edited 6 months ago by Wilt. (2 edits in all)
     
Nov 28, 2017 09:09 as a reply to  @ dmward's post |  #5

That's why I said it was 'interesting', since the details are lacking...what aroused my curiosity, to check one manufacturer's claims vs. his test results. were the relatively long duration measurements for the Full Power measurements, about double what I would expect to see.


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deejjjaaaa
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Nov 28, 2017 09:19 |  #6
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dmward wrote in post #18505755 (external link)
The graphs offered by OP suggest something a bit more sophisticated.

yes, if OP 'd be so kind to share the setup please ?!




  
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williaty
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Nov 28, 2017 11:36 |  #7

Jeeze you guys are antsy! A guy can't even get any sleep around here :lol:

The meter is a Lumu Power.

Early on when I first bought it, I compared blur on a rotating striped disc between a measured flash duration reading and the same duration (using an electronic shutter that had been calibrated by a shutter tester) of continuous exposure as a poor-man's calibration check. The Lumu's flash duration numbers seemed in close agreement with the continuous.




  
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williaty
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Nov 28, 2017 11:37 |  #8

If I happen to remember tonight, I'll re-check the full power duration on both of the Einsteins I have.




  
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Wilt
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Post edited 6 months ago by Wilt. (2 edits in all)
     
Nov 28, 2017 11:49 |  #9

williaty wrote:
Flashpoint Xplor 600
Full 1/250
-1 1/2 1/800
-2 1/4 1/1600
-3 1/8 1/2700
-4 1/16 1/4100
-5 1/32 1/5400
-6 1/64 1/6000
-7 1/128 1/8200
-8 1/256 1/8800

williaty wrote in post #18505894 (external link)
If I happen to remember tonight, I'll re-check the full power duration on both of the Einsteins I have.

It would also be interesting to see the reported values for t0.1 from the Xplor 600's own LCD display, compared to the above measurements taken by your Lumu Power


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williaty
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Nov 28, 2017 12:16 |  #10

Wilt wrote in post #18505906 (external link)
It would also be interesting to see the reported values for t0.1 from the Xplor 600's own LCD display, compared to the above measurements taken by your Lumu Power

There's a video on youtube of someone scrolling through the power settings showing that data. I'm not going to waste time typing it out.




  
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williaty
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Nov 28, 2017 12:20 |  #11

williaty wrote in post #18505926 (external link)
There's a video on youtube of someone scrolling through the power settings showing that data. I'm not going to waste time typing it out.

https://www.youtube.co​m/watch?v=hFEHZYxrPsc (external link)

Summary: my measured values are actually faster than what the light claims except at minimum power. The differences are relatively small and insignificant though.




  
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Wilt
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Post edited 6 months ago by Wilt. (2 edits in all)
     
Nov 28, 2017 12:34 |  #12

williaty wrote in post #18505926 (external link)
There's a video on youtube of someone scrolling through the power settings showing that data. I'm not going to waste time typing it out.

ASSUMING you are referring to the values in this YouTube https://www.youtube.co​m/watch?v=hFEHZYxrPsc (external link)

Lumu values vs. YouTube values

Flashpoint Xplor 600
Full 1/250 vs 1/220
1/2 1/800 vs 1/740
1/4 1/1600 vs 1/1470
1/8 1/2700 vs 1/2352
1/16 1/4100 vs 1/3448
1/32 1/5400 vs 1/4651
1/64 1/6000 vs 1/6250
1/128 1/8200 vs 1/8130
1/256 1/8800 vs 1/10000


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williaty
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Nov 28, 2017 23:23 |  #13

I re-ran the test of the Einstein E640 today. The fractional power numbers were basically identical but the full power numbers were significantly different and much closer to what Paul C Buff claims for them. When I bought the Einsteins used, the previous owner said they had been used very little and been in storage for a very extended period of time. I tested them as soon as I received them. They've now had a year-ish of heavy use and they're testing much faster than when they first awoke from ancient slumber.

The graph in the first post was updated but here it is for good measure:

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Nov 30, 2017 15:55 |  #14

Found a source for flash durations of PCB products..

Here is the link for the Digi-Bee d800 ~~ https://www.konsul-instruments.com …c-buff-digibee-db800-218/ (external link)

And below is a Einstein..


https://www.konsul-instruments.com …c-buff-einstein-e640-222/ (external link)




  
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williaty
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Dec 01, 2017 00:37 |  #15

sincity wrote in post #18507713 (external link)
Found a source for flash durations of PCB products..

Here is the link for the Digi-Bee d800 ~~ https://www.konsul-instruments.com …c-buff-digibee-db800-218/ (external link)

And below is a Einstein..


https://www.konsul-instruments.com …c-buff-einstein-e640-222/ (external link)

The post and plot up top include an Einstein and an Alien Bees B400. The Einstein numbers you linked to are basically identical to mine (in Color mode) in terms of absolute time, so that's good confirmation that these are accurate numbers and the Einstein is fairly consistent from unit to unit.




  
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Results of Flash Duration Measurements on My Various Strobes
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