Lumintop GT4

1039 posts / 0 new
Last post
Tom E
Tom E's picture
Offline
Last seen: 3 hours 54 min ago
Joined: 08/19/2012 - 08:23
Posts: 13127
Location: LI NY

Texas_Ace wrote:
Yes, I did one for NASA and a few others for some BLF members that wanted it. Nasa wanted even warmer then 3000k because like you said, science proves that warmer works better at throw. They had me de-dome the emitter to gain throw and get it even warmer. Ended up around ~2600k-2700k IIRC.

Interesting... We had a couple NASA engineers here at work and they heard about my "hobby" and were very interested so I gave them a run down on current LED tech, modding, drivers, firmware, etc.

Texas_Ace
Texas_Ace's picture
Offline
Last seen: 18 min 5 sec ago
Joined: 03/24/2016 - 07:44
Posts: 8750
Location: Everything is brighter in Texas
Tom E wrote:

Texas_Ace wrote:
Yes, I did one for NASA and a few others for some BLF members that wanted it. Nasa wanted even warmer then 3000k because like you said, science proves that warmer works better at throw. They had me de-dome the emitter to gain throw and get it even warmer. Ended up around ~2600k-2700k IIRC.

Interesting… We had a couple NASA engineers here at work and they heard about my “hobby” and were very interested so I gave them a run down on current LED tech, modding, drivers, firmware, etc.

Interesting indeed. For the record the NASA I am referring to is not NASA directly but a NASA contractor working for a NASA funded think tank as I understand it. They were working on some form of rescue drone at the time IIRC.

Tom E
Tom E's picture
Offline
Last seen: 3 hours 54 min ago
Joined: 08/19/2012 - 08:23
Posts: 13127
Location: LI NY

We work with a project manager who actually works for Oceaneering Space Systems, so at least he's in the NASA offices and we can talk with him now. The other regular NASA engineers are all basically locked out now, barred from entering the building, as we were told. Guess that will end on Monday, least ending for a while.

Xenovora
Offline
Last seen: 5 months 3 weeks ago
Joined: 04/23/2016 - 07:45
Posts: 95

How about 4xCFT90 LEDs? Expensive but how much output and throw we talkin?!?

Blinkinglights
Offline
Last seen: 3 hours 5 min ago
Joined: 01/06/2019 - 06:28
Posts: 123
Location: NY

Does it come with oven mitts?
One 70.2 at 7kl gets VERY hot, can’t wait to burn my hand around 4×70.2.
Put a fan in it you wankers!

Me love lights lonng tyme!

djozz
djozz's picture
Online
Last seen: 4 min 44 sec ago
Joined: 09/07/2012 - 17:04
Posts: 17063
Location: Amsterdam

Blinkinglights wrote:
Does it come with oven mitts?
One 70.2 at 7kl gets VERY hot, can’t wait to burn my hand around 4×70.2.
Put a fan in it you wankers!

The strength of the GT4 is that it is specifically designed for passive cooling with still high sustainable output. Adding a fan would make the design less simple (= bad for a tool), comes with a big waterproofing challenge, and adds a moving part that is likely to fail over time. And it is noisy.
Blinkinglights
Offline
Last seen: 3 hours 5 min ago
Joined: 01/06/2019 - 06:28
Posts: 123
Location: NY

300 watts!
That thing can dissipate 300 watts?
I don’t think so without the inevitable thermal throttling after about 2 mins<. besides who would go swimming with a light like that. one would need a flotation device.
That light has been done before by Acebeam and Imalent, except they added a fans.

Yeah take my money but I want to be able to use the thing for more than 2 minutes at 20kl, or tell the costumers that max sustained output is really 12kl or whatever how much thousands less it can run passive until LVC.

BTW, Lumintop I believe makes some the best lights, I think they could pull off a cooler running solution to the GT4

Me love lights lonng tyme!

mortuus
mortuus's picture
Offline
Last seen: 1 hour 51 min ago
Joined: 12/16/2014 - 09:33
Posts: 2744
Location: Sweden

what makes the gt4 different then acebeams x45 that does 18k lumens and has also 4 x xhp70.2 emitters? and on highest it can run like 3 min or so before stepdown ? but the gt4 has more massive heatsinks so it should run longer and handle the heat better. I dont think adding a fan is a good idea, its clumsy and doesnt really help much its better having a giant heatsink body instead.

lets just wait for lumintops runtimes after CNY and see how it will perform.

...where Frugal meets with Flashlight!

              つ ◕_◕ ༽つ

Xenovora
Offline
Last seen: 5 months 3 weeks ago
Joined: 04/23/2016 - 07:45
Posts: 95
mortuus wrote:
what makes the gt4 different then acebeams x45 that does 18k lumens and has also 4 x xhp70.2 emitters? and on highest it can run like 3 min or so before stepdown ? but the gt4 has more massive heatsinks so it should run longer and handle the heat better.

See that’s what I’m sayin… 4xCFT90 LEDs for the win!

BlueSwordM
BlueSwordM's picture
Offline
Last seen: 2 hours 58 min ago
Joined: 11/29/2017 - 12:34
Posts: 5541
Location: Canada

Do you know how much the light would actually cost 4x CFT90s and a suitable buck driver?

It would easily be in the thousands.

My very own high current Beryllium Copper springs Gen 3:
http://budgetlightforum.com/node/67401
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

LouieAtienza
Offline
Last seen: 1 year 3 months ago
Joined: 11/17/2018 - 15:15
Posts: 593
Location: New York
Xenovora wrote:
mortuus wrote:
what makes the gt4 different then acebeams x45 that does 18k lumens and has also 4 x xhp70.2 emitters? and on highest it can run like 3 min or so before stepdown ? but the gt4 has more massive heatsinks so it should run longer and handle the heat better.

See that’s what I’m sayin… 4xCFT90 LEDs for the win!

Sure if you can feed them about 120-160A and dissipate about 600-800W of heat…

Thinking again, what a great host to run a single CFT-90 at max, at least for a while…

Xenovora
Offline
Last seen: 5 months 3 weeks ago
Joined: 04/23/2016 - 07:45
Posts: 95

Oh… that much amps? Jeez.

Well a light as big as the GT I would think could handle it, even if we are talking burst turbo 1 minute.

Agro
Agro's picture
Offline
Last seen: 13 hours 47 sec ago
Joined: 05/14/2017 - 11:16
Posts: 6172
Location: Ślōnsk
LouieAtienza wrote:
Xenovora wrote:
mortuus wrote:
what makes the gt4 different then acebeams x45 that does 18k lumens and has also 4 x xhp70.2 emitters? and on highest it can run like 3 min or so before stepdown ? but the gt4 has more massive heatsinks so it should run longer and handle the heat better.

See that’s what I’m sayin… 4xCFT90 LEDs for the win!

Sure if you can feed them about 120-160A and dissipate about 600-800W of heat…

Thinking again, what a great host to run a single CFT-90 at max, at least for a while…


4S2P Samsung 20S would drive the emitters hard.
I’m not a big fan of CFT-90 but this would be a real hottie.
Xenovora
Offline
Last seen: 5 months 3 weeks ago
Joined: 04/23/2016 - 07:45
Posts: 95

Vinh of Skylumen already sells it, 1xCFT-90 priced around $500-700, been out for a while now. He has some sick beam shots to go with it too.

I was thinking he could manage a 4xCFT-90 with the quad reflectors and epic heatsink upgrade on this version,

Agro
Agro's picture
Offline
Last seen: 13 hours 47 sec ago
Joined: 05/14/2017 - 11:16
Posts: 6172
Location: Ślōnsk

Xenovora wrote:
Vinh of Skylumen already sells it, 1xCFT-90 priced around $500-700, been out for a while now. He has some sick beam shots to go with it too.

I was thinking he could manage a 4xCFT-90 with the quad reflectors and epic heatsink upgrade on this version,


I believe he did TN40S with 4xCFT-90. So he should be able to do a GT4.
Texas_Ace
Texas_Ace's picture
Offline
Last seen: 18 min 5 sec ago
Joined: 03/24/2016 - 07:44
Posts: 8750
Location: Everything is brighter in Texas

The GT4 will be like the GT and GT70, setup for easy mods down the road. Although CFT-90 will not be a factory option for sure, just far too complicated and costly to be practical.

I am positive that there will be custom mods with this though.

mgracia85
mgracia85's picture
Offline
Last seen: 38 min 39 sec ago
Joined: 12/01/2017 - 18:35
Posts: 268
Location: East Texas

what the difference in price between a CFT-90 and a average cost LED like the 70.2?

I love my wife’s toy poodle

Agro
Agro's picture
Offline
Last seen: 13 hours 47 sec ago
Joined: 05/14/2017 - 11:16
Posts: 6172
Location: Ślōnsk

These are $100 per LED, roughly.

mortuus
mortuus's picture
Offline
Last seen: 1 hour 51 min ago
Joined: 12/16/2014 - 09:33
Posts: 2744
Location: Sweden
Agro wrote:
These are $100 per LED, roughly.

why so expensive, new type of led or ?

...where Frugal meets with Flashlight!

              つ ◕_◕ ༽つ

lawallac
lawallac's picture
Offline
Last seen: 2 days 56 min ago
Joined: 01/04/2012 - 15:31
Posts: 461
Location: WI

$15 per 70.2 vs $100 per cft-90. Also maybe $25.00 for 70.2 driver vs unknown amount, but I would estimate at least $100.00 for cft driver. Also, don’t forget that the 70.2 will have more output but lower luminance than the cft90 at max current. So most likely at least 400.00 more than asking price for base gt4 for a cft90 light would be what I would expect. If custom sourced it will be more.

LouieAtienza
Offline
Last seen: 1 year 3 months ago
Joined: 11/17/2018 - 15:15
Posts: 593
Location: New York
Agro wrote:
These are $100 per LED, roughly.

The highest bin that Mouser has in stock goes for around $116 the last I checked.. and bought! Because I had to have just one…

LouieAtienza
Offline
Last seen: 1 year 3 months ago
Joined: 11/17/2018 - 15:15
Posts: 593
Location: New York
lawallac wrote:
$15 per 70.2 vs $100 per cft-90. Also maybe $25.00 for 70.2 driver vs unknown amount, but I would estimate at least $100.00 for cft driver. Also, don’t forget that the 70.2 will have more output but lower luminance than the cft90 at max current. So most likely at least 400.00 more than asking price for base gt4 for a cft90 light would be what I would expect. If custom sourced it will be more.

Not as simple as that. The highest bin currently available to buy is around $116. Then you somehow have to cram at least a 400W driver in that head. Luminus claims a maximum current of 27A for the CFT-90. and it has been tested at over 40A but with active cooling. I think it’s better to just have one CFT-90 emitter and take advantage of the increase cooling of the GT4 head so the LED can be driven to its full potential, instead of having four under-driven LEDs. Even with one, it won’t be a long-sustained max output. But I think it would be far better with this as a host than the original GT.

Coyotehawk
Offline
Last seen: 31 min 47 sec ago
Joined: 11/24/2017 - 12:12
Posts: 157
Location: Kansas

Incase this thread turns in to the request thread, I’m in for one.

SKV89
Offline
Last seen: 3 hours 20 min ago
Joined: 12/10/2017 - 12:46
Posts: 3986
Location: US

Adhara wrote:
What might this offer not already in say the Imalent R90C? Can’t imagine it would be priced much less than the R90 at the typical coupon/specials @ low $usd200, seems around the same output and throw. Is it expected to hold full output for the duration of cells ability to provide the needed juice, or something like that?

Subbed, interested, curious.

R90C with coupon is about $280. I tested two of them with the TA tube with Maukka calibration. Turn on lumens was about 14k for one and 13k for the other. Newlumen tested his R90C at 16k lumens with the same calibration. The GT4 should make 20k+ lumens but throw might be a bit less than the R90C, unless the domes are shaved.

mortuus
mortuus's picture
Offline
Last seen: 1 hour 51 min ago
Joined: 12/16/2014 - 09:33
Posts: 2744
Location: Sweden
Coyotehawk wrote:
Incase this thread turns in to the request thread, I’m in for one.

it will probably turn into the usual group buy thread later on when its time for that.

...where Frugal meets with Flashlight!

              つ ◕_◕ ༽つ

tmxod
Offline
Last seen: 7 months 1 week ago
Joined: 04/19/2016 - 19:29
Posts: 13
Location: Orlando, FL

commenting to subscribe

nokoff
nokoff's picture
Offline
Last seen: 5 months 3 weeks ago
Joined: 12/12/2013 - 20:26
Posts: 344
Location: East Coast USA

I picked up R90C last year for under $250. I haven’t tested it however it checks all the right boxes with it’s green batt lights, lantern lights, massive throw, and lumens in a compact size when compared to the BLF GT and others that have been mentioned. If the GT4 can’t outthrow the R90C then I definitely won’t be opening up my wallet for the big boy, super fins or not. It’s the high Lumens and throw combo that gets my attention. I guess we’ll just have to wait and see but I’m not a fanboy so it takes results in the end. Heat, size, and UIs aside those are two attributes worth the attention or don’t bother making it IMO.

Nokoff..still Made in China 山寨主義

cris2pu
Offline
Last seen: 2 months 1 week ago
Joined: 01/19/2019 - 17:19
Posts: 28

Interesado

Theodore41
Offline
Last seen: 5 hours 56 min ago
Joined: 02/20/2016 - 12:57
Posts: 1036
Location: Athens Greece.

nokoff wrote:
I picked up R90C last year for under $250. I haven’t tested it however it checks all the right boxes with it’s green batt lights, lantern lights, massive throw, and lumens in a compact size when compared to the BLF GT and others that have been mentioned. If the GT4 can’t outthrow the R90C then I definitely won’t be opening up my wallet for the big boy, super fins or not. It’s the high Lumens and throw combo that gets my attention. I guess we’ll just have to wait and see but I’m not a fanboy so it takes results in the end. Heat, size, and UIs aside those are two attributes worth the attention or don’t bother making it IMO.

Me too.
adam7027
Offline
Last seen: 2 days 7 hours ago
Joined: 09/26/2017 - 13:54
Posts: 476
Location: EU (Hu)

Hello M4DM4X,

If it is possible at any time, please make Lumintop consider one (or more) Neutral White variant as well.

No one made a high CRI flashlight of this size, yet – my suggestion would be: 4500K CCT and 90 CRI. While XHP70.2 90 CRI is not especially good at rendering deep reds (rates around 50 for R9, while R9050 rated Nichias do usually over 65), still it would be a step up in this league (as an usual R70 ‘standard CRI’ emitter has negative values for R9), and it is not much lower in output /M2 vs P2 performance bin/)

Pages