Broncolor vs Profoto Guide number

[andreagenor]

Hi, I'm looking for buy new light and when I see the technical data I was surprised.
Profoto D1 1000w/s Guide number is 64.8 otherwise, Broncolor Senso 1200w/s with Litos Lamp is 45.8.
This numbers are real or there are some error?

Sorry my bad English.

[Dick Roadnight]

Hi, I'm looking for buy new light and when I see the technical data I was surprised.
Profoto D1 1000w/s Guide number is 64.8 otherwise, Broncolor Senso 1200w/s with Litos Lamp is 45.8.
This numbers are real or there are some error?

Perhaps they rate the Profoto with a big para(bolic) reflector?

More watt-seconds into the flash tube does not necessarily mean more light on the subject?

[rcdurston]

Profoto are generally more efficient with their power but reflector design could also be a part of it.

[Kicka]

Take a look at the new Hensel Expert D monoblocks.....
They´ve got better tech data. www.hensel.de
Really a good choice !!

[K.C.]

Perhaps they rate the Profoto with a big para(bolic) reflector?

More watt-seconds into the flash tube does not necessarily mean more light on the subject?

The D1 guide number is based on the built in 70 degree reflector. It's tiny and efficient, creating a lot of light.

[andreagenor]

Thanks all
I saw, the reflector is completely different.
Broncolor is using P70 and Profoto using Magnum reflector.
The shape of P70 is more narrow, but appear less efficient.

I saw this video and probably the only difference is the reflector.
http://youtu.be/E-ro-ST3iuo

I don't believe that Broncolor is so low than Profoto!

[FredBGG]

Your best bet is to take readings with the type of light modelers you like to use.
There really are not many uses for standard reflectors.

Also an important thing to do is test for modelling light and flash consistency.

To give you an example I wanted a system with a large fresnel Spot.
I took a look at Elinchrom, Profoto and Bron.
I took some test shots with just modelling light and just flash and compared the projected shadows and specular reflection.
For that that particular modeler (large fresnel) the Elinchrom was spot on while the other had significant differences.
In particular specular reflected light with the Bron was way the hell off.

If you use soft lights with thick diffusers this is not an issue.

[rcdurston]

Did you use a clear or frosted pyrex in the Profoto? If I remember right it is supposed to be clear.

[AlDoori]

i did a brief test:

pro7s set to 12oows + prohead with uncoated tube: f 11.2

bron opusA2 set to 12oo ws + pulsoG head with uncoated tube: f 11.o


in a large white studio the heads were fixed an stands and pointed straight up. no pyrex. no modifiers. no mod light.
the lightmeter was fixed on a stand 2 or 3 m away.

[vduault]

Have this in mind before comparing..

http://photoartsmonthly.com/blog/2011/06/30/whats-up-with-flash-duration/

[rjkern]

What makes it even more difficult is when you compare a 1000 W/S like the Profoto D1 to the Einstein 640 W/S.... the differences are very sublet, especially with flash duration in a real world test scenario.

http://www.kern-photo.com/index.php/2012/08/einstein-640-vs-profoto-d1-w-phaseone-iq-head-to-head

More power is actually less advantageous when it comes to flash duration because it takes more time to dump the light in the larger capacitors resulting in a slower duration.

[gss]

Have this in mind before comparing..

http://photoartsmonthly.com/blog/2011/06/30/whats-up-with-flash-duration/

That link contained the statement, "Every flash on the market, from the $120  Nikon SB-400 to the $12,000 Profoto Pro 8a Air 2400, offers quickest duration at minimal power and longest duration at maximum power."
Wow.

[K.C.]

That link contained the statement, "Every flash on the market, from the $120  Nikon SB-400 to the $12,000 Profoto Pro 8a Air 2400, offers quickest duration at minimal power and longest duration at maximum power."
Wow.

Wow is right because that statement is completely untrue.

The PF D1 for example has it's shortest duration at it's highest power, one of the design features of that light. The PF Acute is about e opposite, shortest duration begins at approximately 30% power and doesn't get any shorter as power decreases.

[K.C.]

What makes it even more difficult is when you compare a 1000 W/S like the Profoto D1 to the Einstein 640 W/S.... the differences are very sublet, especially with flash duration in a real world test scenario.

http://www.kern-photo.com/index.php/2012/08/einstein-640-vs-profoto-d1-w-phaseone-iq-head-to-head

More power is actually less advantageous when it comes to flash duration because it takes more time to dump the light in the larger capacitors resulting in a slower duration.

Not true at all.

You might want to watch this for a start.

http://www.youtube.com/watch?v=E-ro-ST3iuo