Convoy S2+ SST20 (biscotti) VS XML2 (7135 X 8 chips)

korkfoto · 2019-09-12T18:36:55.000Z

Both have 7135 x 8 chips.
They have the same price.
I am aware of the advantages of the biscotti driver.
I know that SST20 throws farther.

Which one has:

the best thermal management
max output (with the same battery)
autonomy at max output (with the same battery)?

Thank you!

Yokiamy · 2019-09-12T18:44:00.000Z

1, thermal management, they will both become hot in about the sime time period
2, max output —> SST20
3, autonomy (?) don’t know what you mean, battery life will be about the same since both versions deliver max 2,8 Amps.

korkfoto · 2019-09-12T18:54:21.000Z

1. I knew that SST20 geta hot faster.
2.I am asking because I saw ar fasttech that the SST20 variant has 650 lumens max.
3. Set on max mode which one will Haven the longer runtime until it shuts off?

BurningPlayd0h · 2019-09-12T19:44:18.000Z

korkfoto:

I knew that SST20 geta hot faster.
2.I am asking because I saw ar fasttech that the SST20 variant has 650 lumens max.

Set on max mode which one will Haven the longer runtime until it shuts off?

2 - Yes, SST-20 will get ~700 at max on 2.8A, XM-L2 closer to 900-1000. Very little difference to the eye in reality, except that the SST-20 is much throwier as you already know.

3 - Neither. Both those drivers run at 2.8A max, so the drain over the course of one battery’s charge will be basically the same. The XM-L2 will probably gradually dim sooner due to insufficient cell voltage earlier since it has a higher forward voltage.

ggf31416 · 2019-09-12T21:31:17.000Z

Only the SST40 version has thermal management. If you plan to run the 2.8A version until it shutdowns it will burn your fingers.

korkfoto · 2019-09-13T06:00:03.000Z

Thank you.

I plan to use the flashlight as a bike light at cool and cold temperatures.

So, the remaining question is: at 2.8A, which one will last longer?

Catnap · 2019-09-13T13:05:29.000Z

korkfoto:

So, the remaining question is: at 2.8A, which one will last longer?

BurningPlayd0h already answered that question, practically the same as both are regulated to 2.8 amps.

BurningPlayd0h:

Neither. Both those drivers run at 2.8A max, so the drain over the course of one battery’s charge will be basically the same. The XM-L2 will probably gradually dim sooner due to insufficient cell voltage earlier since it has a higher forward voltage.

I personally prefer the sst-20 version as it throws a lot further.

Scallywag · 2019-09-13T13:44:49.000Z

korkfoto:

Thank you.

I plan to use the flashlight as a bike light at cool and cold temperatures.

So, the remaining question is: at 2.8A, which one will last longer?

The SST20 should have lower forward voltage, and therefore will stay in regulation longer… so the runtime at 2.8A will be slightly longer, and the overall runtime will be slightly shorter.

korkfoto · 2019-09-13T14:08:40.000Z

In conclusion:

SST20 throws farther (not that interested in that aspect), has less lumens than XML2 (700 vs 900-1000), stays a bit longer to max output, but it’s overall runtime is shorter.

I’ll go for the old XML2 (4c variant).

Thank you all!