Driver question

[Packesel]

Hi,

I am searching for a driver which gives me this output:

Its the output from the Raidfire

The brightness should be constant until the 18650 shuts down. :candle:

Thanks

Packesel

 

[VidPro]

a lot of the low-voltage drivers will do that, with ONE li-ion. i assume your talking about 1 18650.
why
well as you see in the first there, it went over, so it really did not perfectally regulate, chances are good it was out of regulation when the voltage of the battery was high. AKA, what correctally driven LED do you know that puts out more than 250 lumens out of a light.

this is exacatlly how many of the 1.2-4v drivers act, and it is also dependant on the LEDs Voltage or VF thing. it is a boost driver being used for a voltage that (really) gets to high, although it usually functions ok, it often overdrives the led in the first 10 minutes or about 5-10%.

the overdrive occurs when the "boost" driver isnt in a position to boost anything because the battery voltage is higher than the LED voltage. so the effect is greater or smaller depending on the max charge on the battery, and the led itself your driving.

it is likly to also be a PWM type of levels driver, because on low the PWM pulses were still in overdrive,and so therefore you still have higher spikes When the voltage of the battery was high.

so there are MANY drivers that will work like that.
they range from about 350ma to about 850ma
and can have various ways to have levels TOO.

so what is the drive current you desire
do you want levels and strobe
do you want a few levels or 20

there also exists "wizard" or "flex" type drivers that both buck and boost, are more expencive, usually dont have levels, and will fully regulate from beginning to end, but they are not as popular.

the actual light you mention "1.16A invariable current to the LED"
has a great heat removal capability, for a reason

 

[Packesel]

Hi,

I want more than 200 lumens with a Q5 and one 18650. So I need more than 800 mA. 1000 mA would be OK, too, but I do not really see a difference.
2 modes (high and low) are enough. No SOS, no strobe.

Thanks

Packesel

 

[VidPro]

the high output current is harder to find in boost
so the shark which maxes at 980ma
http://candlepowerforums.com/vb/showthread.php?t=105492

badboy 1000, which i dont think is available

Fatman, maxes at 1000
http://www.taskled.com/techfatman.html

maxflex which might work ok with 1 led and the one li-ion, but because of amperage will not work with multiple leds with such low input voltage.
http://www.taskled.com/techmaxflex.html
has very high current settings available, really designed for MORE input voltage than 1

how about 2 of these boosting
http://www.dealextreme.com/details.dx/sku.4382
problem is same with any boost when VB over VF overdrive

the GD500 or two of them
http://theledguy.chainreactionweb.com/product_info.php?cPath=48_49_61&products_id=920
this would not overdrive is supposed to be buck boost

micropuck times 2
http://www.ledsupply.com/02009-sho.php
this might not handle an overdrive/directdrive when it occurs, but at least is potted

on the "noted" side
http://www.dealextreme.com/details.dx/sku.7612
these will NOT regulate like your showing in the chart, these will just clip the top voltage of the li-ion, insuring that it never overdrives, after that they go direct drive, and dwindle, and that is good, but not what you asked for.

 

[Packesel]

Thanks a lot! The G500 driver looks very nice. It is not complicated and I understand what it does. :thumbsup: