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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 28 Mar 2011 (Monday) 20:41
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Elinchrom Digital Display

 
SilverHCIC
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Mar 28, 2011 20:41 |  #1
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After seeing yet another thread regarding Elinchrom’s digital readout, I thought I’d post an explanation to put an end to any lingering mystery.

The decimal power reading is based on the Joule (or Watt-second), which is equal to 6.25 x 10^18 electron-volts. The scale is divided by 10^18 to proportionalize it to a usable scale.

As a result, if Elinchrom’s digital power display is represented as Y and the energy discharged is represented as X, a conversion can be achieved to determine the number of Joules (Watt-seconds) as follows:

X = (6.25)(2^Y)

Therefore, when the Elinchrom digital display reads Y=5, this translates to an energy discharge of X=(6.25)(2^5) = 200 Ws. Similarly, when the Elinchrom digital display reads Y=4, this translates to an energy discharge of X=(6.25)(2^4) = 100 Ws.

Since the energy relationship is absolute, conversion the other way is also possible. The Elinchrom digital power designation (Y) can be derived from the discharged energy (X) as follows:

Y = [Log (X/6.25)]/[Log(2)]

Therefore, if the strobe is set to discharge X=600 Ws of energy, this translates to an Elinchrom designation of Y=[Log(600/6.25)/[Log(​2)] = 6.58. Similarly, a strobe discharge of X=250 Ws translates to an Elinchrom designation of Y=[Log(250/6.25)]/[Log​(2)] = 5.32.

Elinchrom is not the only company that uses this designation. But they are some of the best-designed units that take advantage of the scaled designation to allow their units to be mixed quite effectively. Since all of their contemporary strobe units utilize this system, they can ALL be mixed while achieving predictable results. In fact, ALL strobe systems (regardless of brand designation) can be mixed with predictable results, as long as they all utilize this scaled designation.


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SilverHCIC
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Mar 28, 2011 20:42 |  #2
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To facilitate mixing strobes which do not utilize this scaled designation, I have included the following table that provides a conversion between the most common energy discharge ranges Joules (Ws) into Elinchrom's scaled designation:

Power (Ws) EU #

1280 = 7.68
1200 = 7.58
1000 = 7.32
800 = 7.00
640 = 6.68
600 = 6.58
500 = 6.32
400 = 6.00
320 = 5.68
300 = 5.58
250 = 5.32
200 = 5.00
160 = 4.68
150 = 4.58
125 = 4.32
100 = 4.00
80 = 3.68
75 = 3.58
62.5 = 3.32
50.0 = 3.00
40.0 = 2.68
37.5 = 2.58
31.25 = 2.32
25.0 = 2.00
20.0 = 1.68
18.75 = 1.58
15.63 = 1.32
12.5 = 1.00
10.0 = 0.68
9.38 = 0.58
7.81 = 0.32
6.25 = 0.00
5.00 = -0.32
4.69 = -0.42
3.91 = -0.68
3.13 = -1.00
2.50 = -1.32


"It's easy to find your bike in transition when you're the last one out of the ocean ... it's no fun being lost at sea :rolleyes:."

  
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SilverHCIC
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Mar 28, 2011 21:00 as a reply to  @ SilverHCIC's post |  #3
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And here are the conversions for Elinchrom's full- and half- decimal scale readings into Joules (Ws):

EU # Power (Ws)

8.0 = 1600.00
7.5 = 1131.37
7.0 = 800.00
6.5 = 565.69
6.0 = 400.00
5.5 = 282.84
5.0 = 200.00
4.5 = 141.42
4.0 = 100.00
3.5 = 70.71
3.0 = 50.00
2.5 = 35.36
2.0 = 25.00
1.5 = 17.68
1.0 = 12.50
0.5 = 8.84
0.0 = 6.25
-0.5 = 4.42
-1.0 = 3.13
-1.5 = 2.21
-2.0 = 1.56


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TMR ­ Design
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Mar 28, 2011 23:55 as a reply to  @ SilverHCIC's post |  #4

OUTSTANDING!!!

Thank you for posting. This is great information and nice to have a simple table with all the numbers.


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Mar 29, 2011 03:03 |  #5

Have to agree... I'm going to print this and tape it to my Ranger... nice work!
Hatch



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Mar 29, 2011 03:04 |  #6

And, IIRC, this is true for the entire Elinchrom line regardless of model...


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Mar 29, 2011 03:24 |  #7

brilliant !


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Mar 29, 2011 05:18 as a reply to  @ spxxxx's post |  #8

Interesting read, think this will be useful.

Hatch1921 wrote in post #12114570 (external link)
Have to agree... I'm going to print this and tape it to my Ranger... nice work!
Hatch

+1 will print this out and keep with the lights :)


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Mar 29, 2011 11:44 |  #9
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FlyingPhotog wrote in post #12114576 (external link)
And, IIRC, this is true for the entire Elinchrom line regardless of model...

Jay, you are correct. The entire Elinchrom line uses this scaled designation, so different models can be mixed with VERY consistent results. Elinchrom's choice to use this scale may seem arbitrary, but it is not. It is very deliberate, and is another example of their well designed product line. The numbers in the digital display have REAL meaning. They can be directly (and absolutely) interpreted as a function of the energy discharged.

I have heard many people suggest that the number scheme is arbitrary, and ponder why a BX500ri goes up to 6.3? ... Why not have it go to 10? The number scale IS NOT ARBITRARY. It is accurately linked to the intensity of the flash output.

I wish all other manufacturers would put such meaningful thought into their user-interfaces. Unfortunately, many other manufacturers simply apply a scale from 1-to-10 onto their units. While this may give some "relative" meaning to the output of that particular device, it has very little comparative value at all.

In contrast, Elinchrom's digital display yields information regarding the relative output of that particular device, plus it provides an accurate output comparison relative to any other Elinchrom device, plus, it yields information regarding the flash energy discharged, plus it provides a comparative reference with any other manufacturer's output (as long as the other manufacturer uses the Eu scale).

All that from a single number on the Elinchrom display. ... Hardly arbitrary!!


"It's easy to find your bike in transition when you're the last one out of the ocean ... it's no fun being lost at sea :rolleyes:."

  
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Mar 29, 2011 15:05 |  #10

Yea VERY cool post! And yes, this is yet ANOTHER thing about Elinchrom that makes them so awesome!


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Mar 29, 2011 15:08 |  #11

Fantastic


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Mar 29, 2011 16:33 |  #12

Many thanks for this :)


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Mar 29, 2011 16:40 |  #13

This is perfect!
Thank you very much!!


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Mar 29, 2011 16:48 |  #14

Thanks for the post :D


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Craig ­ in ­ LA
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Mar 30, 2011 11:45 as a reply to  @ sigma pi's post |  #15
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WOW. WOW. WOW. I just found this from another thread. I have a BXri kit and was looking at another thread and got redirected here. This sure answers a lot of questions I've always had regarding the digital display on my strobes.

I have to admit, I am one of the people who have always found the numbering system to be rather arbitrary. I never knew that it had so much significance. Why doesn't Elinchrom explain this to us? Numbers that don't start at "1" and don't reach "10" just seemed weird to me. But now, I can see exactly why they have the range they do on my strobes.

I actually understand my strobes better now!
THANK YOU for posting this.


--- Craig ---

  
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Elinchrom Digital Display
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