Group Buy Now Live - BLF GT90 SBT-90.2 powered 5,000 Lumen, 1.8Mcd / 2600m Super Thrower

[SKV89]

@mr_magoo

@Jerommel

Aha, so they use a FET driver.
But is it CC or DD ?

I hope to see some SBT-90.2 emitter testing soon.
Wondering about the Vf, of course.
Can’t imagine it’s not closer to 4 Volts at such crazy currents, although Luminus’ other recent LEDs do have a low Vf.

The CCT of Luminus’ low CRI LEDs is unfortunately rather high…
I’ll consider getting a SBT-90.2 when 5000K or lower is available.
Still interesting though for an aspheric with a Wavien collar (which brings down the CCT)

For my stock 1st batch GT i’m waiting for 5000K or lower SST-70.
Should be an easy modification.

I dont have any measuring equipment, and I’m not necessarily a CRI snob, but do appreciate high cri and slightly whiter than incandescent tint when I can get it in a light form factor that fits my needs. That said, the sbt90.2 in my K75 has a quite nice tint for a coolish white, especially on the brighter modes. I’d guess it to be about 5400 to 5600k on turbo. I’m usually pretty sensitive to green and I was pleasantly suprised how creamy white the output was when I first turned it on.

I dont know if the bin is different than the sbt90.2 in my NI40 but it seems to be less prone to green on lower levels…maybe one is FET pwm driven and the other is CC. I’m sure that would make a difference. I know xpl2s look better (at least to me) when fet pwm driven.

Here are measurements for the Acebeam K75 and Nightwatch NI40
The SBT90.2 is on the greenish side except at very high output levels where tint drops below BBL (negative DUV). Tint looks excellent once it gets below BBL.