One possible reason: lower voltage (all LEDs parallel) means higher current for same output which results in more resistance losses in cables, contacts, PCB traces et al.
I’m going on a long bicycle tour and would like to take 2 18650 lights (Lumintop Prince and Nitecore HC30).
Is there a small portable charging device that I could use on my trip that I could charge and carry with me to charge up my batteries along the way?
Yes, there are several options for that. But there is one portable device clearly the most efficient, cheap and compact, it is called ‘spare batteries’
Thanks for all tips guys, managed to get it quite clean.
I have filed down the reflector even more and now the bottom is really thin, just as the gasket, i think this is all i can get out of it, very happy.
To clean it i have rinsed it using running tap water and blew it out using my new dust blower which recently arrived. After that i used 70% rubbing alcohol which i still had lying around (kids…) and used cotton wool which worked great.
Blew it out once again and it ended up really well!
I had a biophysics professor in college who was very fond of saying that any time infinity comes up in physics, it was natures way of telling you that you screwed up the math somewhere.