Lumintop BLF GT94 ( 4 x SBT90.2, 1.65mcd ) NOW AVAILABLE @ Neals: code NDGT94 gives $ 150 off

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Texas_Ace
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Personally I prefer OP reflectors in most lights, the loss in throw is very minor in most cases but the beam looks better to the eye.

ImagioX1
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Mine was just delivered! Can’t wait to get home home and try it out. Got my VTC6s all charged and ready to go.

liteupmynite
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liteupmynite wrote:

Quick beam shot on turbo comparison: GT4 vs GT94

Distance: 9 feet 3 inches.

GT4 step down after: 2:53 m:s

GT94 step down after: 00:58 m:s

NOTE: Large cooling fans was used because of high ambient temperature. Step down times would have been less without fan.

 

 

 

GT4

 

 

 

GT94 with OP reflector

NOTE: Daisy peddle effect was seen on outer edges of beam, but not include here. I wanted to compare the exact same areas of the spot beam.

 

 

 

I will do the same test after I receive the smooth reflector for the GT94.

 

I also noticed that the GT94 I received doesn't appear to be cool white. It has a slight yellow tint. I tested against a while wall in the daytime. The GT4 was definitely cool white, but not the GT94. It this expected?

Nealsgadgets says...

"Description

...

Specifications 

Emitter4x Luminus SBT90.2 LED cool white, mounted on copper DTP MCPCB

..."

 

Texas_Ace
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liteupmynite wrote:

liteupmynite wrote:

Quick beam shot on turbo comparison: GT4 vs GT94


Distance: 9 feet 3 inches.


GT4 step down after: 2:53 m:s


GT94 step down after: 00:58 m:s


NOTE: Large cooling fans was used because of high ambient temperature. Step down times would have been less without fan.


 


 


 


GT4



 


 


 


GT94 with OP reflector


NOTE: Daisy peddle effect was seen on outer edges of beam, but not include here. I wanted to compare the exact same areas of the spot beam.



 


 


 


I will do the same test after I receive the smooth reflector for the GT94.



 


I also noticed that the GT94 I received doesn’t appear to be cool white. It has a slight yellow tint. I tested against a while wall in the daytime. The GT4 was definitely cool white, but not the GT94. It this expected?


Nealsgadgets says…


Description





Specifications 


Emitter4x Luminus SBT90.2 LED cool white, mounted on copper DTP MCPCB


…”


 

I am guessing you are testing at low output levels?

The SBT90.2 does have tint shift depending on the power lever. In the lower power levels it will tend to have a bit of a yellow/green hue. This goes away at higher power levels though.

The SBT90.2 is only available in a CW tint, so it must be CW.

liteupmynite
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Texas_Ace wrote:
liteupmynite wrote:

liteupmynite wrote:

Quick beam shot on turbo comparison: GT4 vs GT94

Distance: 9 feet 3 inches.

GT4 step down after: 2:53 m:s

GT94 step down after: 00:58 m:s

NOTE: Large cooling fans was used because of high ambient temperature. Step down times would have been less without fan.

 

 

GT4

 

 

 

GT94 with OP reflector

NOTE: Daisy peddle effect was seen on outer edges of beam, but not include here. I wanted to compare the exact same areas of the spot beam.

 

 

 

I will do the same test after I receive the smooth reflector for the GT94.

 

I also noticed that the GT94 I received doesn't appear to be cool white. It has a slight yellow tint. I tested against a while wall in the daytime. The GT4 was definitely cool white, but not the GT94. It this expected?

Nealsgadgets says...

"Description

...

Specifications 

Emitter4x Luminus SBT90.2 LED cool white, mounted on copper DTP MCPCB

..."

 

I am guessing you are testing at low output levels? The SBT90.2 does have tint shift depending on the power lever. In the lower power levels it will tend to have a bit of a yellow/green hue. This goes away at higher power levels though. The SBT90.2 is only available in a CW tint, so it must be CW.

 

 No, I was always testing in turbo (the high output level before step down) for both the GT4 and GT94.

 

I will post beam shots later.

Texas_Ace
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Ok, another thing to keep in mind is that it is around ~5700k vs most other CW lights that are 6500k, so it will naturally look warmer then those if that is what you are comparing it to.

liteupmynite
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Texas_Ace wrote:
Ok, another thing to keep in mind is that it is around ~5700k vs most other CW lights that are 6500k, so it will naturally look warmer then those if that is what you are comparing it to.

 

Thanks Texas_Ace.

So are you saying that the GT94's Luminus SBT90.2 LEDs are cool white in 5700K where as the GT4's XHP70.2 LEDs are cool white in 6500K?

 

Here are 2 beam shots, shot against different background colored walls. I may have misinterpreted the beam color based on the wall colors.

 

GT94 beam against a beige colored wall.

 

 

 

GT94 beam against an off-white colored wall.

Tom E
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5700K is in the CW range. NW goes up to 5000K, >5000K is generally considered CW, see here: https://flashlightwiki.com/ANSI_White

 

Texas_Ace
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Correct, the GT4 is 6500k and the GT94 is around 5700k, maybe a bit closer to 5500k. Side by side you will be able to see the tint difference.

Picture looks fine to me given they both have a bad color temp setting (normal for a auto setting).

Although the SBT90.2 is not made in anything but CW, so it is basically zero chance it is anything else. Sad for me, I wish they had a NW version.

I will say that the GT94 tint is acceptable even to my CW hating self.

ImagioX1
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Got my light! Can’t test it though because I accidentally ordered flat top VTC6’s instead of button top Facepalm

Edit: Soldered some tabs on the top of the batteries and got the light to come on. The only words I have are that this light is insane!

ImagioX1
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Check out my beamshots here! There is no comparison between the GT94 and the other lights lol http://budgetlightforum.com/node/74831

Coyotehawk
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I’d like to see some beam shot comparisons next to the GT4 at about 200 yards.

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There is some #'s from a good source showing a 26% bump in candela for swapping an OP to SMO, Matt Smith (VOB) with a Convoy L6 XHP70.2: 

Matt's vid here: https://www.youtube.com/watch?v=TRp8WxJsivw&t=213s

130 kcd to 164 kcd which is a 26% bump, but think the variations from LED to LED, light to light, reflector to reflector is significant.

 

 

Texas_Ace
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Tom E wrote:

There is some #‘s from a good source showing a 26% bump in candela for swapping an OP to SMO, Matt Smith (VOB) with a Convoy L6 XHP70.2: 


Matt’s vid here: https://www.youtube.com/watch?v=TRp8WxJsivw&t=213s


130 kcd to 164 kcd which is a 26% bump, but think the variations from LED to LED, light to light, reflector to reflector is significant.


 


 

Yeah, that is a bit of an outlier in my testing, I think that the combo of the XHP70.2 and the VERY heavy OP on that reflector played a role in the results.

Still, I would not be shocked to see 15-20% gain in lux with a SMO reflector in the GT94 at the cost of the slight donut hole returning.

Hardusvd70
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Texas_Ace wrote:
Tom E wrote:

There is some #‘s from a good source showing a 26% bump in candela for swapping an OP to SMO, Matt Smith (VOB) with a Convoy L6 XHP70.2: 


Matt’s vid here: https://www.youtube.com/watch?v=TRp8WxJsivw&t=213s


130 kcd to 164 kcd which is a 26% bump, but think the variations from LED to LED, light to light, reflector to reflector is significant.


 


 

Yeah, that is a bit of an outlier in my testing, I think that the combo of the XHP70.2 and the VERY heavy OP on that reflector played a role in the results.

Still, I would not be shocked to see 15-20% gain in lux with a SMO reflector in the GT94 at the cost of the slight donut hole returning.


I will have mine Monday or Tuesday. Will do the test.

Hardusvd70

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Mine has Oranges in the reflector..IS THIS NORMAL..LOL..i havent got it yet..still says returned to sender..

I'm ThatCrazyFlashaholic 67

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Brainsick67 wrote:
Mine has Oranges in the reflector..IS THIS NORMAL..LOL..i havent got it yet..still says returned to sender..

I’ll have mine tomorrow.

Hardusvd70

ImagioX1
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Are we going to have to request the smooth reflector or is Neal just automatically sending them out to all of us who got the first batch?

Texas_Ace
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We should know more once the reflectors are made but I am guessing they will be sent automatically but don’t quote me.

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Texas_Ace wrote:
Personally I prefer OP reflectors in most lights, the loss in throw is very minor in most cases but the beam looks better to the eye.

Wow! Can you tell if the beam is emitted from an SMO or OP reflector 1km away? Maybe because the OP reflector emits a weaker beam?

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Texas_Ace wrote:

You can easily recalibrate it from the menu to whatever temperature you want or disable thermal control completely.

Are you sure? I don’t think the driver allows you that

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Giancarlo wrote:
Texas_Ace wrote:

You can easily recalibrate it from the menu to whatever temperature you want or disable thermal control completely.

Are you sure? I don’t think the driver allows you that

It will definitely allows you. I did disable the temperature controls on my GT, GT90 and GT4. Will do my GT94 as well later today. The courier will drop it off in the next two hours.

Hardusvd70

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Just received my BLF GT94

OP reflector.

Measured at 10 meter throw

1.4Mcd

1.416Mcd
-
-
BLF GT4

563Kcd
-
-
Acebeam W30

1.431Mcd
-
-
-
Measured at 20 meter

1.396Mcd
-
-
BLF GT (CW)

Measured at 20 meter
1.116Mcd

Hardusvd70

Texas_Ace
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Giancarlo wrote:
Texas_Ace wrote:

You can easily recalibrate it from the menu to whatever temperature you want or disable thermal control completely.

Are you sure? I don’t think the driver allows you that

I designed the driver (and TomE did the firmware), pretty sure it allows you to recalibrate or disable the thermal control Wink

It explains how in the Narsil instructions.

Texas_Ace
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Giancarlo wrote:
Texas_Ace wrote:
Personally I prefer OP reflectors in most lights, the loss in throw is very minor in most cases but the beam looks better to the eye.

Wow! Can you tell if the beam is emitted from an SMO or OP reflector 1km away? Maybe because the OP reflector emits a weaker beam?

at 1km you will not be able to tell much as it is hard for most human eyes to even see that far clearly.

Although my statement above was a more general opinion I hold, there are exceptions to it of course but in general I pick the OP reflector when available.

In this lights case the SMO reflector has a slight donut hole (simply due to how large the die is on the LED, not much you can do about it). I am guessing the OP reflector would basically eliminate this which would be nice for everything except max range usage IMHO.

Tom E
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The GT94 page says it uses NarsilM and Anduril, so was wondering...

Yes, with NarsilM, you can disable thermal mgt completely.

Texas_Ace
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lol, didn’t see that anduril part before, pretty sure that is just a copy/paste error.

It uses the exact same firmware hex file from the GT70, just on a beefed up driver. So Narsil 1.3 IIRC.

Giancarlo
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Texas_Ace wrote:
I designed the driver (and TomE did the firmware), pretty sure it allows you to recalibrate or disable the thermal control Wink It explains how in the Narsil instructions.

I read in some reviews that the GT94 gets hot very soon. Perhaps the step down set by the factory is to prevent the driver from getting damaged. Buck drivers are delicate. Perhaps it is better to leave the factory settings which has some good reason.

Tom E
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It's not a buck - LED's are wired in 4S, ref here: http://budgetlightforum.com/comment/1687373#comment-1687373

I'm sure it's 2 channels, with the high power channel being a FET. Voltage divider resistors used to monitor battery voltage.

With 4S LED's, amps should be in the ~20 range, instead of ~80 range if they were in parallel.

 

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Texas_Ace wrote:
In this lights [GT94] case the SMO reflector has a slight donut hole (simply due to how large the die is on the LED, not much you can do about it).

I haven’t seen a donut hole in the videos posted on Youtube. Perhaps it is very light and can only be noticed by projecting the beam onto a white wall at very short distance.

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