how hard to push xp-l hi

[joel95ex]

looking to put an xp-l hi in an L2 and wondering how hard I should push it……not sure if Im gonna use a direct drive or linear driver…. thoughts?

[djburkes]

Direct drive will be just fine as long as you have it on a DTP board. That’s all I use though, the only lights I have that do not have a dd driver in them are stock lights that I can’t open up to replace the driver and led.

[will34]

What matters is how many amps you’re pushing, I ran 6.6A through a XPL HI on noctigon with a taskled driver and it killed it instantly. Since then I only run them direct drive, they don’t get past 6A and even in small hosts like the S2+ it works fine.

[SawMaster]

It’s like the old mechanic’s rule of torque: Tighten it till it strips, then next time go 1/2 turn less.

So drive it till it smokes, then next time 500mA less will do the job better

Just joking of course, but what’s life without a bit of humor!
Phil

[tiff_lee]

@djburkes

Direct drive will be just fine as long as you have it on a DTP board. That’s all I use though, the only lights I have that do not have a dd driver in them are stock lights that I can’t open up to replace the driver and led.

DTP board? Direct to pill?

[jhalb]

a.k.a. Direct thermal path…

[jhalb]

a.k.a. Direct thermal path…

[tiff_lee]

whoops, ok cool thanks

[wight]

@will34

What matters is how many amps you’re pushing, I ran 6.6A through a XPL HI on noctigon with a taskled driver and it killed it instantly. Since then I only run them direct drive, they don’t get past 6A and even in small hosts like the S2+ it works fine.

The part I have italicized/stricken is a bit misleading with the context that follows it.

• Yes, DD is usually safe w/ the LED on a DTP MCPCB.
• Yes, the bond wires on these LEDs will poof easily once a high enough current goes through them.
• DD current is not directly comparable to the current from the TaskLED driver, see below.

The TaskLED driver would either be buck or boost. The output from a typical buck or boost LED driver has peaks higher than the average current. These peaks last long enough to poof those bond wires, so the maximum survivable current from a driver of this type will be lower than the maximum survivable DD current.

Let’s reference RMM from RMM’s MTN-MAXlp thread:

@RMM

An Additional Word of Caution Regarding Maximum Amperage. The MAX16820 is a hysteretic converter with a 10% current ripple, meaning that from the center, or average, current set point, the LED will momentarily experience an additional 5% current over the average set current. This means that if you have an LED that can only handle 6A, you need to set the sense resistor at least 5% below that number.

• Example: 6.1A maximum LED, 0.033 Ohm resistor. If all of the components were ideal and perfect, the 0.033 Ohm resistor should give us 6.06A averagecurrent. This sounds safe, but it’s not. The LED will see peak currents of up to 6.36A, which will blow our theoretical 6.1A maximum LED.

[joel95ex]

the most powerful driver I have used was a linear with 14 x .350 7135 chips and tail spring mod. so around 4.9-ish amps

[WillyD]

@will34

What matters is how many amps you’re pushing, I ran 6.6A through a XPL HI on noctigon with a taskled driver and it killed it instantly. Since then I only run them direct drive, they don’t get past 6A and even in small hosts like the S2+ it works fine.

What AWG are you running to the led to get 6A and what cell? On the S2+ I’m assuming you’re using a single 18650. With a 30Q I can’t even get 5A, so I’m trying to figure out where my bottleneck is. Thanks.

[chadvone]

What taskled driver ?