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That's like saying that Eric Clapton uses a Fender guitar, yada-yada. Grimes' work has to do with his vision more than the equipment.
So why the einstein's vs something else like the photogenic? Better power adjustment? Lighter weight?
Those and the remote control system. But there are no perfect lights, and the Einstein is no exception to that. Hensels, for example are great value, with great system accessories, great rear panel controls, but probably too heavy for many.
With the Einstein you have weight, size, color consistency, duration, remote control, and price. On the down side, the same cubic and smooth surfaced housing that provides lightweightedness and compactness makes tilting and swiveling the light difficult, and this is exuberated by the lack of a handle. Moving the lights using a mounted modifier isnít a good idea, because the Balcar mount isnít stella either. The user interface is a mess and there is the modeling light problems already discussed.
I find the 300 W modeling lights on the Profoto D1 heads to be a real boon when shooting with strong ambient lighting. There are really only two downsides to the D1s: the built in reflectors (which on occasion are a help) and the price.
The price of the Einstein, compared to European competitors, is really down to cutting out the middle men: the importer, distributer, and retailer. The constant color and short duration isnít new, others including Photogenic have done that for a while.
You could go through each system and point out weaknesses and strengths, and ultimately, only you can decide which system best fits your needs.