Lumintop GT4

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lawallac
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Texas_Ace wrote:
Yes, the 3000k GT70’s I built did look pretty good and worked well as well.

No idea at this point what tints they will offer though.

Modding is always an option as well, this light will be easily moddable like my past lights.


You did those 3000k variants for who, NASA? I mean I don’t see them custom ordering Warm White because they are tint snobs. It really just works better in atmospheric conditions.
Texas_Ace
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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.

Theodore41
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lawallac wrote:
Theodore41 wrote:
What is ww please?
Warm white, more like incandescent color.

Thank you very much.

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

Blinkinglights
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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!

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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
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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!

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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.

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

It would easily be in the thousands.

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LouieAtienza
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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
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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.

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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
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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,

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

It would easily be in the thousands.

And there are customers. If BLF makes this, and Vinh says he’d do it, one of two i’d buy would go to him to do just that, or completely rip all the head and do a Sirius III, the prior iterations of Sirius all sold out, at “thousands” each.
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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.
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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.

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

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Agro
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These are $100 per LED, roughly.

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Agro wrote:
These are $100 per LED, roughly.

why so expensive, new type of led or ?

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lawallac
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$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.

Adhara
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mortuus wrote:
Agro wrote:
These are $100 per LED, roughly.

why so expensive, new type of led or ?

No, it’s been around for a bit. It was designed to be used in similar applications as a short-arc, and is ideal for high-lumens throwers with its combination of characteristics. Getting such high luminance in a surface area of its size is no small feat, and expensive.
LouieAtienza
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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
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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.

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

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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.

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SKV89 wrote:
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.

Not during Xmas – got it for quite a bit less.
Quote:
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.
Thanks for the info. I will be keeping my eye on the GT4, hoping it may be made available as a host since I plan on having Vinh do something crazy with it.

R

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