SantaClawz
Newly Enlightened
Just curious if anybody heard anything like this or what you guys think?
Are we going to see a new Fenix LD20 or it's successor with Cree XM-L anytime soon?
- Thread starter SantaClawz
- Start date
Help Support Candle Power Flashlight Forum
peterharvey73
Flashlight Enthusiast
- Joined
- Apr 12, 2011
- Messages
- 1,005
Unfortunately unlikely.
Coz LD20 has 21.5 mm, or roughly 1/4 inch diameter head, hence reflector will be narrower still.
Current Cree XP-G R5 emitter is a square roughly 1.25mm by 1.25mm.
New XM-L T6 emitter is 2mm by 2mm square.
The new XM-L emitters @ 2mm by 2mm are too big for the LD20's head size of 21.5mm, therefore you will get a lot of flood laterally, and not much throw longitudinally - hence it's unlikely that this will be released anytime too soon.
But you never know...
Coz LD20 has 21.5 mm, or roughly 1/4 inch diameter head, hence reflector will be narrower still.
Current Cree XP-G R5 emitter is a square roughly 1.25mm by 1.25mm.
New XM-L T6 emitter is 2mm by 2mm square.
The new XM-L emitters @ 2mm by 2mm are too big for the LD20's head size of 21.5mm, therefore you will get a lot of flood laterally, and not much throw longitudinally - hence it's unlikely that this will be released anytime too soon.
But you never know...
peterharvey73
Flashlight Enthusiast
- Joined
- Apr 12, 2011
- Messages
- 1,005
Sorry, 21.5 mm is closer to 4/5th of an inch diameter head...
SantaClawz
Newly Enlightened
If it would make the light more floody, that wouldnt be such a bad thing for some, would make a good indoor light I think.
Maybe Cree will make something 3mm^2 square, splitting the difference in size between xp-g & xm-l.
Fenix could use that, and still retain some throw.
What ever LED Fenix uses for the next iteration, I'd hope Fenix would use a buck/boost circuit, instead of just a boost-because the Vf drops as the LED gets bigger (and in general over time).
And 5 [steady state] output modes. 250 / 100 / 29 / 6 / 1 lumens
Fenix could use that, and still retain some throw.
What ever LED Fenix uses for the next iteration, I'd hope Fenix would use a buck/boost circuit, instead of just a boost-because the Vf drops as the LED gets bigger (and in general over time).
And 5 [steady state] output modes. 250 / 100 / 29 / 6 / 1 lumens
peterharvey73
Flashlight Enthusiast
- Joined
- Apr 12, 2011
- Messages
- 1,005
The old Cree XR-E R2's are a die of 1mm by 1mm, capable of being driven to something like 0.75 amps, and 200+ lumens.
Current XP-G R5 is some 1.25mm by 1.25mm capable of driving to some 1.5 amps, and 300+ lumens.
New XM-L T6 2mm by 2mm, capable of 3 amps and 1000 lumens.
A Luminus SST-50 is 2.25mm by 2.25mm, driven up to 5 amps, to deliver 1000 lumens.
A Luminus SST-90 emitter is 3mm by 3mm, driven up to some 9 amp, to deliver a max of some 2250 lumens.
The XM-L, SST-50 & 90 are big emitters, mainly for big flashlights, with big reflectors.
I reckon they must keep the old XP-G R5 1.25mm by 1.25mm smaller emitters, and extract more lumens out of them, so that the small pocket size flashlights still have good throw.
They can extract more light by increasing the efficiency, since only 5% of the energy is turned into light, while the other 95% is turned into heat!
They could also make the XP-G die more heat resistant, so that it can be driven to higher amperages.
Presently, the XP-G R5 can only be driven to some 1.5 amps, above that, beyond specifications, it can melt or burn out.
So if we can drive the XP-G to say 3 amps, just like the XM-L's, then the XP-G R5 will output more light and lumens.
The new XM-L's can normally manage 3 amps, coz it's bigger size can withstand more heat build up.
Thus, they must try to make XP-G R5 emitters more thermally efficient [with less heat loss], and more resistant to heat build up, to be able to accept higher current/amperage, without increasing the die size from the original 1.25mm by 1.25mm, to maintain good throw in pocket size flashlights with compact reflectors that are often only 1 inch in diameter...
Current XP-G R5 is some 1.25mm by 1.25mm capable of driving to some 1.5 amps, and 300+ lumens.
New XM-L T6 2mm by 2mm, capable of 3 amps and 1000 lumens.
A Luminus SST-50 is 2.25mm by 2.25mm, driven up to 5 amps, to deliver 1000 lumens.
A Luminus SST-90 emitter is 3mm by 3mm, driven up to some 9 amp, to deliver a max of some 2250 lumens.
The XM-L, SST-50 & 90 are big emitters, mainly for big flashlights, with big reflectors.
I reckon they must keep the old XP-G R5 1.25mm by 1.25mm smaller emitters, and extract more lumens out of them, so that the small pocket size flashlights still have good throw.
They can extract more light by increasing the efficiency, since only 5% of the energy is turned into light, while the other 95% is turned into heat!
They could also make the XP-G die more heat resistant, so that it can be driven to higher amperages.
Presently, the XP-G R5 can only be driven to some 1.5 amps, above that, beyond specifications, it can melt or burn out.
So if we can drive the XP-G to say 3 amps, just like the XM-L's, then the XP-G R5 will output more light and lumens.
The new XM-L's can normally manage 3 amps, coz it's bigger size can withstand more heat build up.
Thus, they must try to make XP-G R5 emitters more thermally efficient [with less heat loss], and more resistant to heat build up, to be able to accept higher current/amperage, without increasing the die size from the original 1.25mm by 1.25mm, to maintain good throw in pocket size flashlights with compact reflectors that are often only 1 inch in diameter...
peterharvey73
Flashlight Enthusiast
- Joined
- Apr 12, 2011
- Messages
- 1,005
Actually, a Luminus SST-50 can be driven to something like 1200 or 1250 lumens...
