LIVE: Lumintop ODF30 groupbuy

71 posts / 0 new
Last post
Petr J.
Petr J.'s picture
Offline
Last seen: 2 hours 17 min ago
Joined: 05/20/2018 - 10:07
Posts: 80
Location: CZ

I do not know, I tried several times. The current was roughly the same. In just one attempt, he briefly exceeded 10 amperes. I have a newer version with a spring on the driver. The wire I used to measure is copper and has 2 millimeters on average.

The day when I won't use the flashlight, as if he wasn't.

Azza
Offline
Last seen: 2 days 2 min ago
Joined: 03/24/2018 - 18:40
Posts: 44
JasonWW wrote:
I use the same clamp meter as you, but a shorter and thicker jumper wire. Maybe that is why we are getting different readings?

Does this mean that such clamp meters (as the red one used in the above pic) will only give ballpark or varying readings & not accurate or consistent readings?

JasonWW
JasonWW's picture
Online
Last seen: 6 min 3 sec ago
Joined: 10/22/2016 - 11:41
Posts: 7960
Location: Houston Texas
Azza wrote:
JasonWW wrote:
I use the same clamp meter as you, but a shorter and thicker jumper wire. Maybe that is why we are getting different readings?

Does this mean that such clamp meters (as the red one used in the above pic) will only give ballpark or varying readings & not accurate or consistent readings?


No. These meters should be pretty accurate. I get very consistent readings everytime. I decided to check the accuracy stated on the meters spec sheet. For the 20A range of DC current it shows plus or minus 2% plus 3%. This means all the UT210E meters should have less than a 4% deviation between them. I think it also means they all read 3% low. Let’s forget that 3% part because I don’t really understand it and it’s confusing.

So if I measure 9A, the real number could be from 8.82 to 9.18. If Petr measures 9.6A with the same battery model and same voltage then the difference is probably due to something else. The difference is roo large to be due to the meter (if we trust the specs).

There are many variables inside the light, battery, the test wire length and gauge, springs, etc… than can effect an amp draw test. Pushing down on the battery when doing the test saw the amperage drop from 8.7 to 8.35. That was neat to watch.

As I said earlier, as voltage drops the amperage increases. As resistance increases, amperage increases.

Even though Petr and I are measuring with the same model black Liitokala battery, there might also be small differences in its internal resistance that can effect the current draw. Certainly a battery with protection circuitry will have increased resistance and draw more amperage. Some batteries have bigger voltage sag under load and will draw more current.

His light might have a bit more resistance in the driver spring or the driver might just be drawing a bit less power. His driver might not have as good a ground path as mine, etc…

Just to see if the test wire made a difference, I measuring my light on turbo using a thin piece of speaker wire and got about 9A compared to 8.7A using a very heavy gauge wire.

I also tested it with a protected KeepPower 5200mah (protection circuit rated at 10A) since I didn’t need the tail cap to fit. At 4.1 volt I saw it draw 10.6A for a second and then step down to 4.34A.

I tested a Samsung 30Q (4.1v) and got a steady 9.3A. The smaller 30Q has a bit more voltage sag under load then the cyan and black Liitokala’s which explains why the amperage draw was a little bit higher.

I hope that helps explain that there are lots of variables.

My Convoy L6 thread with XHP70.2, Texas Avenger FET driver, Narsil v1.2 ramping firmware (old), lighted side switch and cut down SMO reflector. Lots of amp draws on stock driver as well. 

My Supfire L5-S thread with XHP70.2, 26350 cells (4,100 lumen!), Texas Avenger FET driver, NarsilM v1.0 ramping firmware and lighted side switch. My mini L6! 

9 NarsilM user videos for BLF Q8, GT, GT Mini and ROT66

Texas_Ace BLF Calibrated Lumen tube

Maukka Calibration Lights for DIY Lumen Measuring Devices

The Burgh
The Burgh's picture
Offline
Last seen: 3 hours 20 min ago
Joined: 02/07/2014 - 18:12
Posts: 366
Location: Great Pacific Northwest, USA
Pete7874 wrote:
The Burgh wrote:
With the permanently compressed spring, my ODF30 has no tolerance for battery length at all. It fits or it does not.
which cell are you using in this light?

Unfortunately, the only batteries in my stock that fit perfectly are Keeppower Protected 26650, 5200 mAh. Have some longer unprotecteds on order, hoping for a perfect fit (a bit under 70mm).

There will always be more darkness than I have lights.

JasonWW
JasonWW's picture
Online
Last seen: 6 min 3 sec ago
Joined: 10/22/2016 - 11:41
Posts: 7960
Location: Houston Texas
The Burgh wrote:
Pete7874 wrote:
The Burgh wrote:
With the permanently compressed spring, my ODF30 has no tolerance for battery length at all. It fits or it does not.
which cell are you using in this light?

Unfortunately, the only batteries in my stock that fit perfectly are Keeppower Protected 26650, 5200 mAh. Have some longer unprotecteds on order, hoping for a perfect fit (a bit under 70mm).


Dude, just bend the metal tab back.

You can’t even run turbo with those cells.

My Convoy L6 thread with XHP70.2, Texas Avenger FET driver, Narsil v1.2 ramping firmware (old), lighted side switch and cut down SMO reflector. Lots of amp draws on stock driver as well. 

My Supfire L5-S thread with XHP70.2, 26350 cells (4,100 lumen!), Texas Avenger FET driver, NarsilM v1.0 ramping firmware and lighted side switch. My mini L6! 

9 NarsilM user videos for BLF Q8, GT, GT Mini and ROT66

Texas_Ace BLF Calibrated Lumen tube

Maukka Calibration Lights for DIY Lumen Measuring Devices

M4D M4X
M4D M4X's picture
Online
Last seen: 5 min 3 sec ago
Joined: 03/19/2014 - 05:17
Posts: 6381
Location: Austria (GMT + 1)

I played a bit with my bench power supply

find all available items in this list

i launched my new blog - all deals for members without MAP B$ Wink

find a short description about my idea here

 

if you want to buy a flashlight or battery for a better price: just send a mail - i will try to save you money!

Petr J.
Petr J.'s picture
Offline
Last seen: 2 hours 17 min ago
Joined: 05/20/2018 - 10:07
Posts: 80
Location: CZ

Interestingly. During testing, I did not measure battery voltage, just current. The battery was fully charged at 4.2 volts. When the turbo was taken, the voltage on the battery dropped to about 3.7 volts. This corresponds to a current consumption of 9.6 Amps.

The day when I won't use the flashlight, as if he wasn't.

M4D M4X
M4D M4X's picture
Online
Last seen: 5 min 3 sec ago
Joined: 03/19/2014 - 05:17
Posts: 6381
Location: Austria (GMT + 1)

i assume the resistances and resulting voltage drop is very individual.

same cell might give different results in 2 lights....

 

while playing around i found turbo not working when i slipped off the spring a bit making bad contact

find all available items in this list

i launched my new blog - all deals for members without MAP B$ Wink

find a short description about my idea here

 

if you want to buy a flashlight or battery for a better price: just send a mail - i will try to save you money!

JasonWW
JasonWW's picture
Online
Last seen: 6 min 3 sec ago
Joined: 10/22/2016 - 11:41
Posts: 7960
Location: Houston Texas

Martin, do you think the heat build up on Turbo can vary based on the type of battery used?

Using my cyan Liitokala 5000 I got 1 minute and 37 seconds before it started to ramp down.

Another tester used a unprotected black KeepPower 5200 and got 2 minutes 30 seconds before it started to ramp down.

I compared these two batteries on HKJ’s comparator and the KeepPower has much more voltage sag.

I have a theory that it’s the battery effecting the heat build up. What do you think?

My Convoy L6 thread with XHP70.2, Texas Avenger FET driver, Narsil v1.2 ramping firmware (old), lighted side switch and cut down SMO reflector. Lots of amp draws on stock driver as well. 

My Supfire L5-S thread with XHP70.2, 26350 cells (4,100 lumen!), Texas Avenger FET driver, NarsilM v1.0 ramping firmware and lighted side switch. My mini L6! 

9 NarsilM user videos for BLF Q8, GT, GT Mini and ROT66

Texas_Ace BLF Calibrated Lumen tube

Maukka Calibration Lights for DIY Lumen Measuring Devices

Newlumen
Newlumen's picture
Offline
Last seen: 1 hour 11 min ago
Joined: 05/27/2017 - 00:19
Posts: 1568
Location: United states

I just wish lumintop use double spring on this odf30…

Pages