Q8, PMS SEND TO THOSE WITH ISSUES BLF soda can light

I ran a 5,000 lumens SRK style 5X (Fing below) light for 2 1/2 minutes, and it began to get warm/hot, but this was a well heat sinked modded light, so the idea is to get the heat to the outside. Can't really compare a 12K-15K light (4K-5K per XHP-70 LED) that Mike C built with what we are talking about. He's pulling 15A at twice the voltage, equal to 30A from 4P cells. No idea what you are trying to say here, or compare to, but Mike C's custom build is wayyyy different. I can't find him mentioning cells, but the only way I see that working is with up to 8 18350's, so about half the capacity of 4 18650's we got here. Besides getting hot after one minute, the cells would probably deplete in 10-12 minutes, if I did the math correct.

Just for comparison purposes:


A SecurityLng SF55 4X SRK clone, modded by replacing the LED's with U2 3C's on the stock aluminum MCPCB, upgrading LED wires, and adding some thermal grease for the contact to the large MCPCB, does:

Lumens: 2,686 @start, 2,492 @ 30secs, 22.5 kcd (300 meters)


A TangsPower Fing 5X SRK clone, has smaller reflectors, fully modded with 4 U3 3D's and 1 U4 1C in the center on Noctigons, 2.5 mm thick copper shelf, 7135 based driver, 14.66A measured at the tail (clamp meter):

Lumens: 5,134 @start, 4,910 @ 30secs, 41.5 kcd (407 meters)


A SupFire M6 3X SRK clone, heavily modded with U3-2A's on 20mm Noctigons, FET+1 DD driver:

Lumens: 5,202 @start, 4,991 @ 30secs, 65.5 kcd (512 meters)


Note: An SRK running at a stable 15A on 4 Samsung 30Q BT's would run for 48 minutes (12Ah/15A = 0.8 hours).

I’m in thank you.

What I’m saying is that you can buy stock, single emitter lights right now that do 4000lumens, all be it maybe not soda can style.

A BLF special with input from plenty of modders should maybe aim for more? Runtime is a mute point as this would probably be a 1 minute step down turbo and at the other end we can have a nice moon that runs for the 500hrs.

A BLF SRK would be nice, but it would be nicer if it genuinely was special.

Maybe a poll, would you prefer:
A. 4000lumens constant max
B. 10000lumens turbo with step down to 4000constant high

I’d like a high mode that would allow for the highest brightness that could be run continuously (until the cells start to run out of juice) without causing thermal issues. Turbo could of course go much higher.

With 6V emitters we have to use a battery-carryer like the TN36 or similar. And a mod to 12V would be easy.
I would prefer higher lumens. But the price would be more than the actual planing with 3V emitters.

My 3 emitter SRK has XHP50 with 4.3 Amps for each emitter and a thick chopper heatsink.

4000 lumens out of a soupcan is only achieved with modding or spending a lot.
That there are stock lights using series configuration and do 4000+ lumens is not really relevant here.
Show me a stock parallel configuration light doing 4K and one that does 10K and we will look at them with interest and in awe.

This is a hard one to judge, will it be for use in this great land where evening temps are often in the mid 20c or in one of the northern states of the USA or northern Europe where they are often below freezing ?
I have one light, an XPH50 at 5A, that is a pain to hold when ambient is around 25c but real nice hand warmer when its down to less than 10c :smiley:

Cheers David

I realize that a super low mode could run for hundreds of hours, but I would like see a medium-ish mode that allows for significant run time and also plenty of light.

I’m wondering if any of you gurus can guesstimate the most efficient medium/high lumen output with extended runtime for this type of SRK setup.

Cheers!

The settings allow a range of modes
So indeed using a mode suitable should not be a problem :slight_smile:

Right, I get that… but I am wondering if based on the LEDs/Driver combination there would be a sweet spot of greatest output for lowest power expenditure. And if so, then what that output might be.

Thanks again

I’d have 3500-4500lm in turbo for 1 minute or less. Then step down to max mode with 2000-2500lm
We can’t have more with SRK soupcan body.
Roche m170 is bigger and has more weight for his ~2600lm max mode

Caleb, Tom will probably shed some light on this
What I do know is that we aim at a ramping mode to choose besides the normal modes. And in my typical use I mainly set a light to a brightness I need (outside max, inside med for example) so the ramping would allow for minimum needed brightness in any situation thus prolonging use.

To get a feeling and gaining knowledge for this group buy, I just finished a 9xXP-L Hi SRK-clone mod that draws 24A (see the what did you mod today thread). It has warm white emitters so the (continuous) output is ‘only’ 4500 lumen (5600lm at start-up), but the power consumption is 90W. It is too hot to hold in (just measured) exactly two minutes (room temperature without air flow). Too hot to hold for a light with a good thermal path in my experience is the correct moment for a stepdown (a safe distance from damage). At the same current, with cool white or neutral XP-L emitters, this light would put out well over 6000 lumen, with added DTP-boards 7000. It feels that the body can handle that, but for a stock light to handle these amps and heat it requires a good design with no mistakes. We are aiming for that of course. And we’re making a 4 emitter light, not 9, so if we really want 6000 lumen OTF that requires very hard driven XP-L leds.
A stable continuous output (room temperature, no airflow) for a host like this appears 6A/2000 lumen to me, with airflow at least double that.

If I were to run a customer BG light, I would want the light to be running above 10000 lumens to make it extremely unique

This group buy is for a 4x parallel battery, 4 led light. You can not get 2500 lumen OTF out of any 3V type led.

Sounds great! Can’t wait to see what specs/price it will have.
I’ve seen the 10K mark mentioned before so surely there will be interest!

I have a UltraFire 7XML SRK clone that puts out more then 3000 lumen stock - guestimate from ceiling bounce with a lux meter. It is 5-8% dimmer then the massive TR-S700 that has been reviewed here at 3500 lumen.

I would love this BLF SRK to go up to more then 5k lumen on turbo and 3k+ on high. More then that would require 6V/12V and a more complicated battery setup which will raise the cost. That would be for a future 12V edition you can start your car with… :wink:

Well, 4x XP-L V6 @3A each will make ~5000 lumens at start. I think I’d be happy enough with that output. It would be ~41.5 watts to the four emitters. Can the host take that? I don’t know. I’ve never owned a SRK. I seriously don’t want it pushed so hard that reliability becomes an issue. And I don’t want any ~6V or ~12V emitters in this light! Maybe we can work out ~6V emitters in V2. :wink:

1 xpl nw for me plz

Yes I think maybe you guys are right, the 10k+ lumens obviously needs the series cell setup and so is out of the scope of this.

Maybe a different thread for a totally separate light with series cells and XHP, obviously we would be looking at a $150+ light. Maybe not so much interest on BLF :confused:

I’m still looking forward to this light, shaping up well for the original design plan :sunglasses: