Anway, this isn't a scientific test, but I think it will work for my needs. I set up a Greytag Macbeth Color Checker and a WhiBal card at about 5 feet from a light stand. Took a series of photos at full power, 1/2, 1/4 (or -1, -2), etc. with each head. 7" standard reflector on the Excalibur and Speedotron, the 10" ring reflector (no diffuser) on the Alien Bee. I then opened all the files in Adobe Camera Raw 5.2 and used the White Balance tool to read the WhiBal in each image and wrote down the color temp and tint that resulted.
Here are the results:
ColorTemp Adjusted To
Tint Adjusted To
SP Systems Excalibur 3200
Alien Bees ABR800 Ring Light
Speedotron Force 5
As you can see, they are all pretty consistent. The color of the light goes slightly bluer (requiring a little bit more yellow compensation in the Color Temperature scale) as the power is lowered. I believe that is to be expected.
I also metered all three heads in the same configuration at 5 feet at full / minimum power:
Excalibur: 22 / 8
Alien Bee Ring Light: 32 / 5.6
Speedotron Force 5: 32 / 5.6
I won't list the watt-second ratings, as I don't think that number matters much, especially when comparing different brands of strobe heads. Watt-seconds measures how much energy can be stored in the capacitor. It doesn't really tell us much about the efficiency of the system.
Bottom line, I'm happy with all of these products.
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