Lumintop GT Mini (Thower) Beam shots and more!

[Texas_Ace]

@toobadorz

@Texas_Ace

Overall most will not notice the difference, the base firmware I used was basically the GT firmware so it still works fine, it was just not optimized for this driver and light.

Yeah. So far the most noticeable part is, when stepping down from FET to 7135 due to low battery, the light is actually becoming brighter. This is because the firmware avoids activating two channels at once, and when the battery voltage is low, the FET can be darker than the 7135, thus “stepping-down to a brighter level” can happen. This can certainly be fixed by tuning the voltage that triggers this.

Yes, that is a possible issue with how it is setup now. A minor but notable issues.

This firmware was just meant for prototyping, it was never intended to be used in the final driver.

[Niko]

i have booth, gt is slighty longer but better lies in hand. emisar is more powerfull. booth are great

[Newlumen]

[quote=Niko]
i have booth, gt is slighty longer but better lies in hand. emisar is more powerfull. booth are great

you might be right about the d1s. I dont have a mini gt or calibrated lights for the tube… i measured d1s cool white @ 1400 lumen using Sony vtc6…

[mortuus]

emisar is not more powerful, i think the beam on gt mini is slightly sharper.

[Niko]

@mortuus

emisar is not more powerful, i think the beam on gt mini is slightly sharper.

i have booth light, have you too?
my emisar is more powerfull

[JasonWW]

@Niko

@mortuus

emisar is not more powerful, i think the beam on gt mini is slightly sharper.

I have both light, have you too?
My emisar is more powerful

Why is it?

They are both FET drivers and the same emitter. Maybe one has a better battery? Have you checked their amp draw?

[mortuus]

@Niko

@mortuus

emisar is not more powerful, i think the beam on gt mini is slightly sharper.

i have booth light, have you too?
my emisar is more powerfull

well no but i want to believe so

[Newlumen]

I have a d1s… the beam is tight and intense… can’t say about mini gt yet… hopefully it will be good.

[d_t_a]

Not an apples-to-apples comparison, but here I got some images of GT Mini CW vs GT Mini NW and also Emisar D1 V2-3A

GT Mini CW (left) vs GT Mini NW (right)

(building is about 125 meters or 400 feet distance)

The second pic has the D1S (3A) on the left and GT Mini (NW) on the right.

For some reason, the GT Mini (CW) looks a bit less bright or focused than the GT Mini NW or the D1S 3A. Maybe it's just the more neutral tints look better at night?

Distance according to Google maps: ~126 meters or ~400 feet (actual distance is a bit more, because that is ground-to-ground-distance, the actual is from a lower ground level pointing several stories upwards to the opposite building at a slight angle)

[Texas_Ace]

This is what should happen actually, given equal outputs the neutral white will throw better. The warmer wavelengths are less prone to refraction in the atmosphere and thus travel further.

[Agro]

@Texas_Ace

This is what should happen actually, given equal outputs the neutral white will throw better. The warmer wavelengths are less prone to refraction in the atmosphere and thus travel further.

I think someone tested it at long distance with GT and the test result did not match that theory….
I guess we need more data to draw conclusions.

[Texas_Ace]

@Agro

@Texas_Ace

This is what should happen actually, given equal outputs the neutral white will throw better. The warmer wavelengths are less prone to refraction in the atmosphere and thus travel further.

I think someone tested it at long distance with GT and the test result did not match that theory….
I guess we need more data to draw conclusions.

That was because the CW LED was a higher bin and thus had more lumens then the NW LED.

Naturally higher output will throw further.

If they are the same output the warmer tint throws further. The same reason sunsets are orange and the sky is blue.

[mortuus]

so warmer tint regardless how warm it is will always go further then cw light? wow i didnt know that…

[Texas_Ace]

@mortuus

so warmer tint regardless how warm it is will always go further then cw light? wow i didnt know that…

If everything else is equal, yes, warmer wavelengths of light travel further.

This is the same reason NASA wanted a 2700k warm white LED in the GT they got.

[komeko]

Today I picked up my GTMini.
Charged to full 30Q and such results:
5.8A on the back of the cap
23 micro Amper drainage (backlight off)
1392 lumen
118kcd
color in turbo 4430K BBL 4D (almost identically as UT02)

Now I have virtually identical performance as my modified UT02 with 1510 lumens. The same range, color, beam … only in a smaller and lighter package. In conclusion, a very nice flashlight.

[ChibiM]

@komeko

Today I picked up my GTMini. Charged to full 30Q and such results: 5.8A on the back of the cap 23 micro Amper drainage (backlight off) 1392 lumen 118kcd color in turbo 4430K BBL 4D (almost identically as UT02) Now I have virtually identical performance as my modified UT02 with 1510 lumens. The same range, color, beam … only in a smaller and lighter package. In conclusion, a very nice flashlight.

At what distance did you measure 118kcd?

[komeko]

The measurement was at a distance of 5m and gave a result of 4717. 117877 is the result at 1m distance, calculated.

[Newlumen]

@komeko

Today I picked up my GTMini.
Charged to full 30Q and such results:
5.8A on the back of the cap
23 micro Amper drainage (backlight off)
1392 lumen
118kcd
color in turbo 4430K BBL 4D (almost identically as UT02)

Now I have virtually identical performance as my modified UT02 with 1510 lumens. The same range, color, beam … only in a smaller and lighter package. In conclusion, a very nice flashlight.

Thanks for the lumen number… i got 1390 lumen on my mini gt cw with the sony vtc6…

[Agro]

@Texas_Ace

@Agro

@Texas_Ace

This is what should happen actually, given equal outputs the neutral white will throw better. The warmer wavelengths are less prone to refraction in the atmosphere and thus travel further.

I think someone tested it at long distance with GT and the test result did not match that theory….
I guess we need more data to draw conclusions.

That was because the CW LED was a higher bin and thus had more lumens then the NW LED.

Naturally higher output will throw further.

If they are the same output the warmer tint throws further. The same reason sunsets are orange and the sky is blue.

Can’t find it now to check, but I believe the test didn’t compare throw but rather the difference between short-distance and long-distance throw, negating any bin difference.

[Texas_Ace]

@Agro

@Texas_Ace

@Agro

@Texas_Ace

This is what should happen actually, given equal outputs the neutral white will throw better. The warmer wavelengths are less prone to refraction in the atmosphere and thus travel further.

I think someone tested it at long distance with GT and the test result did not match that theory….
I guess we need more data to draw conclusions.

That was because the CW LED was a higher bin and thus had more lumens then the NW LED.

Naturally higher output will throw further.

If they are the same output the warmer tint throws further. The same reason sunsets are orange and the sky is blue.

Can’t find it now to check, but I believe the test didn’t compare throw but rather the difference between short-distance and long-distance throw, negating any bin difference.

Oh, you must be talking about a different test then the one I am thinking of, the only one I know of is the one DB custom did where he used a higher bin CW emitter.

Another factor is that camera sensors are also more sensitive to cooler temperatures (which is why they generally use a CW flash as the sensor works best with that).

Also if the air is very clean, then the advantage of the warmer tint is greatly reduced (same reason that the sky is blue when the sun is overhead but orange when it is hitting the atmosphere sideways it has to travel through more of it).

I have seen it with my own eyes many times, in the real world the warmer tints allows me to see further.

All that said, the difference is fairly minor in most cases when it comes to flashlights and getting the tint you prefer is the best choice as that will make you happier overall. There is no right or wrong answer.