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| p.3 #11 · p.3 #11 · Einstein 640 vs Profoto D1 comparison by Kern-Photo |
All valid points guys, let's discuss:
I just kept our product specs/name etc. out of the game (except the Ws) to not promote our product. The strobe we used was released a few years ago, so this is not a product launch/introduction attempt. Board admins don't really like that.
The main reason I chimed in was
a) that the comparison had flaws, especially in the power settings. That's why I compared our recent on-the-fly test regarding output. If the Einstein really has pseudo-stops and around 400 Ws max than it would have around 100 Ws at 1/8 which makes it comparable to the D1 at 1/8 with around 125 Ws. Also non-IGBT units cannot compete with an IGBT unit when it comes to flash duration anyway.
b) To inspire to compare and test yourself. I'll bet you'd have similar results with most other units out there no matter what you own...well, except WL and AB. BTW, we did the comparison with an AB800 ("320 Ws") as well a few weeks back and the power difference is pretty much consistent with the Einstein comparison.
We know that Ws specifications are taken with a grain of salt, b/c they are easy to manipulate (no really, it has XXX Ws) just by not stating the true value or inventing something like true/effective Ws to confuse the customer. What you cannot really pimp is the GN, i.e. light meter readings, except if you use spotty reflectors or change the distance. Usually, GN measurements are done with silver coated 7", ca. 50º standard reflectors and most of the brands actually comply to this "standard".
I understand that comparing LED's with flash tubes doesn't make sense, but these are all xenon flash tubes. Some of the brands use pyrex tubes, some use quartz - this might cause a slight difference. The coating is pretty much the same. I accept that frosted/coated pyrex domes can make more of a difference. All in all, these differences would be in 1/10th of stop range, but not half to full stops.
In the end, "brightness" or better luminous intensity has the dimension of J=Ws and does matter, b/c it is one of the variables that determines your light meter reading next to distance and the reflector used. See above regarding reflectors used during measurements - of course, everyone can cheat though. And yes, modeling lamps can truly differ in effectiveness, I just stated that a supposedly stronger 250 W (about 66% stronger) tube at Einstein's max power is actually dimmer than a 150 W halogen tube in ours. Effectiveness cannot really account for a 100 W difference IMO, but maybe I'm alone on this one. Also, the Einstein halogen tube was not frosted, ours was frosted.
I agree, that saying it was "brighter" sounds not precise enough...but the difference was at least half a stop (Einstein < ours), when it pretty much should be the other way around.
- As I mentioned it was bare bulb, forgot to mention though that both were used with frosted domes
- no reflector at all
- distance to object 2m | 6 ft
- Sekonic 758 light meter
This was a crude test and since we always want to reproduce test results, we will do more testing to actually show the precise recorded readings later.