I doubt they made any changes to the reflector, personally. Pixel counting in MS-Paint told me they are within 1mm of each other. The original GT had a massively oversized opening for the XHP35 which by my measurement is ~17.5mm, ~2mm more than is needed to envelop an SST90.
Anyway… I’ll stop now.
Goodluck with the GB TA! Thank you for your contributions here
Bought one. Thanks fellow Texan!
Just so you know, I am on your side. I was the one that pushed hard for the GT70 conversion kit when they did not want to do it at all. Sadly the results of that are what makes me think a GT90 conversion is not likely as much as I agree it would be a very nice option.
I have not given up but I do know when to pick my battles, and there is zero chance of it happening as long as they can’t get enough LED’s for the complete lights. Once the LED supply stabilizes is the time I can bring up this option and see what they say. Until then I would just be beating my head against a wall lol.
Haha me too!
What I found with these super throwers that have 1.5mcd+ is that it lights up more near objects or animals VERY well, which is what I was needing since on my ranch the distances to things I want to see very clearly (put alot of light on) was further than my 600kcd lights were able to illuminate enough.
Also, that laser beam of daylight is something coyotes and foxes havent seen before, and it scares them off like a rifle shot…
Would have been cool to see this with a top of the line buck convertor. Oh well, it’s already out of my price range.
While a buck driver would be fantastic. With the SBT90.2 a buck driver would make the driver MUCH more expensive and less reliable. Skylumen had a lot of issues getting a buck driver to work with these LED’s and spent a LOT of money on them and he had US manufactures make them. I just don’t trust china to handle that kind of thing right now without a very good and tested reference design to work from.
That said the FET driver in the GT90 does manage to push 27A to the LED and maintains a more stable output then competing lights that do use buck drivers over time. So I would not say we are giving up much.
I read in another thread where people were saying animals are insensitive to bright flashlights at night. Maybe those flashlights weren’t bright enough. I blasted my W30 at a skunk and it immediately ran for its life.
Just ordered the whole SBT90.2 kit. Thanks Texas_Ace.
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.
From the K75 Driver thread, it’s been measured to run around 3.5V on turbo (~29A). So very low indeed.
I really don’t need this, I have a Thrunite Catapult V6, a Noctigon K1, waiting for an FT03S, …
So I bought one, of course. Thanks for the GB, TA!
Edit: Does this take button-top cells like other BLF GT? Found the answer in the description. Button-top unprotected.
If I hadnt just bought the acebeam k75, I’d be all over this. It should have better heat management (though the weight might be a bit much for extended periods)
It depends on the wildlife, but I think most animals are quite sensitive to white light. Other colors? varies from species to species.
Coyotes and foxes can definitely see white light beams- they bolt at the first sight of a bright beam of light where the hunting pressure is heavy so most predator hunters use a red or green filter when it’s legal to use artificial lighting.
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.
That is indeed low.
Not really worth it to run it on an expensive (because very high current) buck driver then.
Low efficiency LED though.
50 Lumen per Watt or something…
I measured the SBT-90.2 in my K30-GT at ~5200K. I’m not sure of the tint bin in the GT90 but the one in my K30-GT is quite a nasty green (mostly in the corona) at lower outputs. The FET driver in the GT90 might provide a bit better tint.
I actually find myself primarily using the lowest output modes while I’m out on my night walks.
I see quite a bit of wildlife on my nightly trail walks, mostly small mammals and such. Some of them, like rabbits, mice and coyotes, run away at the first sign of light. Others, like raccoons, beavers and owls tend to freeze while they try to figure out what the heck the light is. If I suddenly turn off the light and they see me, then they run/fly away.
I actually had an owl swoop down at me and almost snatch my cap away after I shined a light on him for a couple minutes and then abruptly turned it off.
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.
One benefit of the FET driver in the GT90 is that once you get past the low modes and the main FET kicks in, the tint should improve to basically the same as the turbo tint for the rest of the ramp.
Write it to Neal,he knows.
I see that it is another company ready to make a new light,quite a beast, with the same SBT-90.2 led,but even bigger reflector than the BLF-G. Astrolux.
Were you in the Caer Bennog area? 