Hello everybody,
I recently bought a Convoy S21A XHP50.2 4000k with a bicycle TIR. Before buying I asked Simon (Convoy), if this will work as a bicycle light…
After delivery I installed the TIR instead of the orange peel reflector.
While used as a bike light the S21A changes modes by itself and also stopped working in some cases.
Before explaining all the details, here are my questions:
- Can I make this light work?
- Or should I buy another one?
——- DETAILS ——-
1. The light changed modes during the ride. I have already contacted Simon and he helped me with some ideas/solutions. Probably the battery and the copper column of the driver lose contact while riding over bumps. I have a 12 mode driver for the XHP50.2. According to Simon a spring on the driver side would be better. Advice from Simon: add the glass lens. I did that. Now the problem is much less often on a ride on smooth road surfaces. But of course I also want to ride offroad and need a reliable bike light for every surface.
2. The light stopped working during longer bike rides. Before this happened the light changed modes very fast. Then the light stopped working completly.
I was not able to switch the light on again. After unscrewing the front part and screwing it back on the light, the light worked for a few minutes of riding. Then the same problem.
It is probably because of the pill unscrewing itself. Together with the inserted glass lens and an extremly strong tightened pill (advice by Simon… I think tighter would destroy something) it did not happen during my last ride. But I don’t want that this problem happens next week or later… especially not when I don’t have needle pliers with me and maybe no backup lights.
In the meantime I watched a video from Weerapat Kiatdumrong, a great teacher in flashlight stuff. Here I learned about the possible unscrewing of the pill (at 2:02). https://www.youtube.com/watch?v=uvOerRD5fgs
I asked Simon if I should buy a S21B instead and if it is better for bicycle riding… he told me that the driver in the S21B is the same as in S21A (12 mode for XHP50.2 with copper column). I am very thankful for his answers and helpful advises… at the end he did not tell me which drivers or lights are suitable. :-/ I saw on the Aliexpress pictures that the driver for an SST40-LED has a spring… are these pictures correct?
——- MY QUESTIONS ——-
- Can I make this light work?
- Or should I buy another light? (In this case: Which light should I buy? Convoy S21B? With which driver and led?)
- Or should I buy a light from another brand?
- Any other advice?
Additional information:
- All test rides are with the included 21700 battery: Liitokala Lii50E (5000mAh). Charged.
- I tested one time with a 18650 battery: when shaking the S21A in a moderate way the light changes modes. Is this normal?
- 12 mode driver. I use it in group 2 (deactivates all the blinkies).
- How the light is build at the moment: o-ring - glass lens - TIR lens - pill - battery. (I have removed the gasket and the orange peel reflector.)
- I prefer a budget solution, because I am on a budget. But I completly understand that nothing is for free.
- I had no similar problems while riding with my other two flashlights: Sofin SC31 Pro or Astrolux ST01 (SST40). I even use an 18650 battery in the Astrolux (which is a 21700 light). I bought the Convoy S21A because of the bicycle lens and the floodier XHP50.2.
- I really appreciate your help and comments. Thank you very very very much!
:heart_eyes: