The Fenix-Store        
Results 1 to 18 of 18

Thread: ZebraLight H53c Runtimes Less than Specified

  1. #1
    Flashaholic
    Join Date
    Aug 2017
    Location
    Canada
    Posts
    258

    Default ZebraLight H53c Runtimes Less than Specified

    I recently tested my ZebraLight H53c using the ceilingbounce app for Android and got shorter than expected runtimes.

    I tested using several Eneloop Pro AAs each charged with an Eneloop BQ-CC17 charger to at least 1.4V. Here are the results:

    Output Measured Runtime Specified Runtime
    56Lm 400min 510min
    171Lm 115min 138min
    I ran my Fenix HL50 at 150Lm for 124min before it reduced output, as the specs suggested. Assuming the flashlights have similar efficiencies, this makes the ZL's runtimes seem like reasonable values to me since the HL50's output has slightly less lumens and has a lower CRI and higher CCT (I'm basing the CRI/CCT assumption on the specs of H53w and H53c).

    ZebraLight customer service has been very responsive and has offered to repair or replace the light. I am located in Canada however and am waiting to see if they cover shipping.

    My questions are:


    • Does it look like ZebraLight exaggerated their runtimes?
    • Can any H53x owners test the runtimes of their lights and report their findings?

  2. #2
    Flashaholic*
    Join Date
    Jul 2016
    Location
    Bergen, Norway
    Posts
    726

    Default Re: ZebraLight H53c Runtimes Less than Specified

    Were the cells fresh? Old?
    I'm curious if the runtime would be different if you cycled the cells a few times (refresh program on some chargers, or just manually), and tested again.

    I wouldn't expect the numbers to be completely dead on, but the difference (esp. on 56 lumen) is larger than I'd expect.

    Also, are you set up for measuring lumens? Also curious if it put out more lumens, or there's another cause.

    Sorry for offering nothing by questions.

  3. #3

    Default Re: ZebraLight H53c Runtimes Less than Specified

    Quote Originally Posted by likethevegetable View Post
    I recently tested my ZebraLight H53c using the ceilingbounce app for Android and got shorter than expected runtimes.


    • Can any H53x owners test the runtimes of their lights and report their findings?
    Hello, and welcome to CPF.

    I have a Zebralight SC53w. Its output is higher than that of the SC53c (and the H53c), but the runtimes, according to Zebralight's website, are the same for all four models. (H53w, H53c, SC53w, Sc53c)

    I tested my SC53 yesterday, in the highest more (330 lm) using the ceilingbounce app and a Fujitsu HR-3UTHC, 2450 mAh.



    I hope I will find the time to test Mode H2b, 198 lm (=171 lm on the SC/H53c models) later tonight.

  4. #4
    Flashaholic
    Join Date
    Aug 2017
    Location
    Canada
    Posts
    258

    Default Re: ZebraLight H53c Runtimes Less than Specified

    Quote Originally Posted by terjee View Post
    Were the cells fresh? Old?
    I'm curious if the runtime would be different if you cycled the cells a few times (refresh program on some chargers, or just manually), and tested again.

    I wouldn't expect the numbers to be completely dead on, but the difference (esp. on 56 lumen) is larger than I'd expect.

    Also, are you set up for measuring lumens? Also curious if it put out more lumens, or there's another cause.

    Sorry for offering nothing by questions.
    The cells are quite new: I purchased them less than a year ago and each cell has seen at most 5 charges. I only used relative output as the metric for this test, however I trust that the lumen output is indeed close enough to 56 lumens because the perceived brightness is identical compared to my HL50 at 55Lms.


    Quote Originally Posted by Swede74 View Post
    Hello, and welcome to CPF. http://www.candlepowerforums.com/vb/...es/welcome.gif

    I have a Zebralight SC53w. Its output is higher than that of the SC53c (and the H53c), but the runtimes, according to Zebralight's website, are the same for all four models. (H53w, H53c, SC53w, Sc53c)

    I tested my SC53 yesterday, in the highest more (330 lm) using the ceilingbounce app and a Fujitsu HR-3UTHC, 2450 mAh.

    I hope I will find the time to test Mode H2b, 198 lm (=171 lm on the SC/H53c models) later tonight.
    Thank you for the welcome!

    That would be excellent - any additional tests would be appreciated. I will conduct some tests at different outputs when I can. Please see the curves I generated below:




  5. #5

    Default Re: ZebraLight H53c Runtimes Less than Specified



    I got about 120 minutes. The cell I used for the test is brand new and has only gone through 3-4 charge/discharge cycles; I am not sure if it has reached its peak performance yet.

  6. #6

    Default Re: ZebraLight H53c Runtimes Less than Specified

    Quote Originally Posted by likethevegetable View Post
    • Does it look like ZebraLight exaggerated their runtimes?
    maybe, or brightness is different, or test procedure and hardware are different

    could it also be that you expect regulated runtime, and Zebra continues the runtime until the light drops to 10% of initial brightness?

    Quote Originally Posted by Swede74 View Post


    I got about 120 minutes.
    I really like your pics!
    Zebra counted until 138 minutes.. to me it looks like its technically past the 10% minimum output.. but, are we just splitting minutes?

    different test protocols with different end points to end the test?: (regulated vs 10% vs 5%)
    Last edited by jon_slider; 08-25-2017 at 04:01 PM.
    Want to Buy Eye10 TiC (or I would trade one of my Titanium Rotaries)

  7. #7

    Default Re: ZebraLight H53c Runtimes Less than Specified

    Quote Originally Posted by jon_slider View Post
    maybe, or brightness is different, or test procedure and hardware are different

    could it also be that you expect regulated runtime, and Zebra continues the runtime until the light drops to 10% of initial brightness?
    Zebra quotes regulated runtime. I did a 200lm mode test on my H53Fc with Eneloop pro and I got around ~1hr13min before it steps down to 100lm, instead of ZL's claim of 1hr36min. Here's their reply:

    "Runtimes after stepping down (i.e. 100Lm in your case) are not counted in the specs. The difference between 1 hour 13 min and 1 hour 36 min is mostly caused by deviation between samples and testing conditions (batteries, ...) We usually put a smaller (minimum) figure in the spec."

    I choose to believe them given their track record and credibility.

  8. #8

    Default Re: ZebraLight H53c Runtimes Less than Specified

    try not to take specs too literally, ymmv
    here are the 5 tests people have mentioned so far (please repost with correct numbers if I made an error)
    Last edited by jon_slider; 08-25-2017 at 07:31 PM.
    Want to Buy Eye10 TiC (or I would trade one of my Titanium Rotaries)

  9. #9

    Default Re: ZebraLight H53c Runtimes Less than Specified

    You'll find similar exaggeration if you could measure lumen output too...and the low low efficiency specs (in lumen-hours) can be off by multiples, like my sample.

    But to be fair, there are plenty of other manufacturers that exaggerate as well.
    Last edited by reppans; 08-25-2017 at 07:51 PM.

  10. #10

    Default Re: ZebraLight H53c Runtimes Less than Specified

    BTW there is a H53Fc review on TLF with a 276lm runtime graph indicating ZL's runtime claim is very accurate, which is another reason I choose to believe ZL: http://www.taschenlampen-forum.de/th...i-93-95.56751/

  11. #11

    Default Re: ZebraLight H53c Runtimes Less than Specified

    Quote Originally Posted by TCY View Post
    The difference between 1 hour 13 min and 1 hour 36 min is mostly caused by deviation between samples and testing conditions
    that is a deviation in which spec is 32% higher than actual output

    The OP has a light in which spec is 28% higher than actual output..
    Zebra offered to replace it.. I think he should take them up on their offer.. once the postage detail is resolved.

    I agree some tested lights meet or exceed spec, so if the OP trades in his light, I hope we get good news regarding the replacement meeting or exceeding specs.

    I think its really cool theres an app for that!
    Last edited by jon_slider; 08-25-2017 at 09:23 PM.
    Want to Buy Eye10 TiC (or I would trade one of my Titanium Rotaries)

  12. #12
    Flashaholic
    Join Date
    Aug 2017
    Location
    Canada
    Posts
    258

    Default Re: ZebraLight H53c Runtimes Less than Specified

    Thanks for the replies, folks!

    I ran the H53c at 285Lm and got 64min at the knee point, that's about 20% more than the quoted time. The light was nice and toasty after.



    It looks like there's a trend amongst our findings - more accurate specs at higher outputs.

    On another note, I've noticed that the H52w and ArmyTek Tiara Pro both list runtimes at around 30Lm for 12hrs using a 2000mAh Eneloop. The H53c at 26Lm lists 21 hours. If we consider 2000mAh vs 2500mAh and assume the actual run times are about 80% less than ZL specs, the results are similar:

    21hr*(2000/2500)*(0.8) ~ 12hr

    (please forgive my crude approximations for rounding and neglecting non-linearities)

    My concerns of having a defective light are assauged!

  13. #13

    Default Re: ZebraLight H53c Runtimes Less than Specified

    Quote Originally Posted by likethevegetable View Post
    My concerns of having a defective light are assauged!
    YAY!:-)
    assuagement is the most important thing

    Enjoy your Light!
    Want to Buy Eye10 TiC (or I would trade one of my Titanium Rotaries)

  14. #14
    Flashaholic*
    Join Date
    Mar 2003
    Location
    Atlanta, GA
    Posts
    1,213

    Default Re: ZebraLight H53c Runtimes Less than Specified

    I have been on this forum for 10 plus years and every month there is another bad review about ZL. I don't believe a word of it. ZL was the original designer and there are now a dozen copycats on their design. I have a feeling these copycats do more than just copy..... I cant believe the level that is being tried to discredit ZL. ZL is the most trusted brand up there with SF and Streamlight. I cant believe this kind of posting is allowed. It systematically happens with new creative ways to discredit ZL. By now to me is not a coincidence.

    10 years ago if anyone said anything bad about SF the poster would get banned.

  15. #15
    Moderator
    Join Date
    Feb 2003
    Location
    CA
    Posts
    12,039

    Default Re: ZebraLight H53c Runtimes Less than Specified

    Quote Originally Posted by marinemaster View Post
    10 years ago if anyone said anything bad about SF the poster would get banned.
    Only if a member stepped over the line and was violating Rule 4. Many SF threads were closed because they ended up with many Rule 4 violations. They just got out of hand. Am replying because this thread is doing quite well, and members are civil to each other.

    Bill

  16. #16
    Flashaholic* Niconical's Avatar
    Join Date
    May 2008
    Location
    Spain
    Posts
    916

    Default Re: ZebraLight H53c Runtimes Less than Specified

    What's the android app called?

    I searched the Play Store for ceiling bounce and ceilingbounce but no results.

    Thanks :-)
    WTB Xeno F7 v6 Nichia version - PM if you have one for sale

  17. #17

    Default Re: ZebraLight H53c Runtimes Less than Specified

    Quote Originally Posted by Niconical View Post
    What's the android app called?
    Introducing Ceilingbounce - flashlight testing and runtime graphs for Android
    its not in the store yet,
    Last edited by jon_slider; 08-26-2017 at 03:39 AM.
    Want to Buy Eye10 TiC (or I would trade one of my Titanium Rotaries)

  18. #18
    Flashaholic
    Join Date
    Aug 2017
    Location
    Canada
    Posts
    258

    Default Re: ZebraLight H53c Runtimes Less than Specified

    Quote Originally Posted by marinemaster View Post
    I have been on this forum for 10 plus years and every month there is another bad review about ZL. I don't believe a word of it. ZL was the original designer and there are now a dozen copycats on their design. I have a feeling these copycats do more than just copy..... I cant believe the level that is being tried to discredit ZL. ZL is the most trusted brand up there with SF and Streamlight. I cant believe this kind of posting is allowed. It systematically happens with new creative ways to discredit ZL. By now to me is not a coincidence.

    10 years ago if anyone said anything bad about SF the poster would get banned.
    I'm not discrediting ZL, I'm simply providing evidence that I received a product that has underperformed compared to what they had specified, and some fellow flashlight enthusiasts have voluntarily corroborated my findings. I also mentioned that ZL has courteously addressed this concern and offered to remediate it. What I did not mention is that this is my first ZL and it is by far my favorite light, and despite my test results it still outperforms my Fenix and Thrunite AA lights in every way.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •