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This light has about 1/3 less lumens but gains 3x the throw vs the GT4.
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I am visualizing the beam performance and the beam profile, and I like what I see, and I think that only this light has both this much throw and this much power. There are other lights nearby in the flashlight universe, but they are either significantly less power or significantly less throw. Nothing against them, I have them, I like them, but I don't have this one.
This light is currently the first and only offering in the sixth class of 90.2 flashlights: SBT90.2 emitter, multiple emitter, size of reflector = large.
I have SBT90.2, single emitter, small, medium and large reflector classes filled. All good there.
SBT90.2, multiple emitter, medium size, this class was recently announced in another thread on this forum.
SBT 90.2, multiple emitter, small size: I will have to wait for someone to put this class of flashlight forth.
This light, multiple 90.2, large size, is currently a must have to achieve completion of the six classes of 90.2 flashlights.
I have not heard it from an official source, it kind of surprises me if so to be honest and I would not expect much of a discount if the head is sold separately.
It is possible, just not sure the savings will be worth it.
Unimpressed. Since many people don't know or don't care about light faithfulness, this is what you get.
Make a perfect CRI thrower, and it will allow you to see better than any other whatever flashlight.