Jonas
Newly Enlightened
Hi CPF
I am reading in CPF for quite a while now.
But this is my first post as I need some help and maybe ideas from you.
I am more the realistic lumen guy.
For me a constant brightness is more important as a short time working turbo mode!
No need for SOS/strobe etc..
Iindirect accessable slow beacon is nice, but that depends...
What I would like to do
A SureFire G2 host is sitting around for a long time now - empty.
I need a dropin for it but could not find the "perfect" one for me.
If there is one that fits the following specs, I am happy for some recomendations!
I like it to be perfect and good quality (like Oveready dropins), do not mind to spent a bit of money for it to have it as I want it.
I would like to build it myself as I have all the needed knowledge.
The main thing I could not find is a good driver that fits all my needs.
I am also happy for recommendations on other parts as well...no question!
Here is what it should have:
--> P60 format, must fit a SureFire G2 without having a gap between head an body as it is the case with (for example) oveready dropin
--> spring or massive gold plated pad for positive contact, no thin layer on pcb itself!
--> XM-L2 / XP-L or other LED that delivers a good mix of flood and spot with the right reflector (no thrower combination!)
--> OP reflector with brass or copper pill (found one that fits my needs from fasttech for XM-L led) but did not buy it yet
--> led with neutral color temperature (lets say between 4000k and 4500k)
--> capable of handling 1x li-io (unprotected) or 2 CR123
--> voltage range 2.8V - 6V
--> very stable regulation on both configurations of cells down to 2.8V [important!]
--> reverse battery protection
--> battery warning at a slightly higher voltage as forward voltage of led (lets say 3V) [important!]
--> low voltage shut off (~2.5V, better little bit higher)
--> 1 or 2 modes (lo / hi or just hi)
--> no mode memory
--> no PWM, only if very(!) high frequency
--> hi mode should be max 300 lumen (XM-L2 neutral white U2 does that at 700mA and 85°C, even more at 25°C)
--> lo mode should be about 1/10 of hi, for this case 30 lumen
What I am up to is a dropin with a good runtime that does not create a lot of heat.
Should be able to run at hi constantly in the G2 host without overheating the led/driver.
To know when the battery is depleated is one of the most importatnt things, next to constant brightness over entire battery life. I hate a dimming light! For me at the end better shuts off at full brightness insted of doing long dimming.
Battery warning could be blinking (3 times or so) when regulation is not capable of driving any of the two modes at 100% anymore or
switching from hi to low at same case and do blinking only in lo mode when not capable of runnig at 100% in lo mode. For example the battery warning HDS systems using is what I like!
All that leaves a thight spot to focus on.
I am ok with leaving the track a litte bit to have something that fits the most important points.
One is that I would be okay to have it optimized for li-io for example or just hi mode insted of hi / lo.
Hopefully I mentioned everything I was thinking about.
I very much apprieciate any comments that help me building that dropin!
I am reading in CPF for quite a while now.
But this is my first post as I need some help and maybe ideas from you.
I am more the realistic lumen guy.
For me a constant brightness is more important as a short time working turbo mode!
No need for SOS/strobe etc..
Iindirect accessable slow beacon is nice, but that depends...
What I would like to do
A SureFire G2 host is sitting around for a long time now - empty.
I need a dropin for it but could not find the "perfect" one for me.
If there is one that fits the following specs, I am happy for some recomendations!
I like it to be perfect and good quality (like Oveready dropins), do not mind to spent a bit of money for it to have it as I want it.
I would like to build it myself as I have all the needed knowledge.
The main thing I could not find is a good driver that fits all my needs.
I am also happy for recommendations on other parts as well...no question!
Here is what it should have:
--> P60 format, must fit a SureFire G2 without having a gap between head an body as it is the case with (for example) oveready dropin
--> spring or massive gold plated pad for positive contact, no thin layer on pcb itself!
--> XM-L2 / XP-L or other LED that delivers a good mix of flood and spot with the right reflector (no thrower combination!)
--> OP reflector with brass or copper pill (found one that fits my needs from fasttech for XM-L led) but did not buy it yet
--> led with neutral color temperature (lets say between 4000k and 4500k)
--> capable of handling 1x li-io (unprotected) or 2 CR123
--> voltage range 2.8V - 6V
--> very stable regulation on both configurations of cells down to 2.8V [important!]
--> reverse battery protection
--> battery warning at a slightly higher voltage as forward voltage of led (lets say 3V) [important!]
--> low voltage shut off (~2.5V, better little bit higher)
--> 1 or 2 modes (lo / hi or just hi)
--> no mode memory
--> no PWM, only if very(!) high frequency
--> hi mode should be max 300 lumen (XM-L2 neutral white U2 does that at 700mA and 85°C, even more at 25°C)
--> lo mode should be about 1/10 of hi, for this case 30 lumen
What I am up to is a dropin with a good runtime that does not create a lot of heat.
Should be able to run at hi constantly in the G2 host without overheating the led/driver.
To know when the battery is depleated is one of the most importatnt things, next to constant brightness over entire battery life. I hate a dimming light! For me at the end better shuts off at full brightness insted of doing long dimming.
Battery warning could be blinking (3 times or so) when regulation is not capable of driving any of the two modes at 100% anymore or
switching from hi to low at same case and do blinking only in lo mode when not capable of runnig at 100% in lo mode. For example the battery warning HDS systems using is what I like!
All that leaves a thight spot to focus on.
I am ok with leaving the track a litte bit to have something that fits the most important points.
One is that I would be okay to have it optimized for li-io for example or just hi mode insted of hi / lo.
Hopefully I mentioned everything I was thinking about.
I very much apprieciate any comments that help me building that dropin!