Yes, I realize my reviews may make certain lights look "glamorous", and contribute to that desire to acquire them. :shrug:You are the best, and the reason why I am broke...
Out of curiosity, is there anything missing from these primers that people would like to see me cover in future ones?
That's a good idea. It is a lot to cover, but I would likely focus on rechargeables (NiMH and Li-ion), and the basic charger options. Good opportunity to explain why users of Li-ions should invest in a DMM ...I think an overview of batteries would be much appreciated. Perhaps it seems like a huge undertaking as there is quite a lot to cover: chemistry, capacity, charging, safety et cetera, but if you have the time and energy (pun intended) I for one would, as always, be grateful for your hard work.
It's a good point - although one the experts in the battery and electronics subforum here could answer better than I. Simply put, higher voltages make it easier for circuits to drive the output higher (and two cells in series have twice the voltage of single cells). But I'd have to let the experts there really get into the details. :wave:Great primer videos. Would you consider doing a video on the relationship of volts and amps to lux? Not the complicated formulas but a simple guideline on how battery volts effect brightness. Why are my LED's brighter when powered by 2 16340 3.7v (charged to 4.2) rather than 1 18650 3.7v (charged to 4.2v) when the 18650 holds more than twice the capacity of the 16340?
Thank you for the interesting and informative videos, which I also found entertaining - though the latter may not have been their intended purpose . They also sparked a couple of questions, or perhaps even concerns:
1. Do you think it is possible that a light that uses pulse width modulation on lower levels may be harmful to a person's eyes if used for extended periods of time, for instance when reading on a bus? I didn't know until I watched your video that PWM means the emitter is always driven at 100%; my concern is that the pupil may not have time to contract during the very short bursts of light, like it would if you used a light that puts out hundreds of lumens (constantly) as a reading light. To put it in another way, is it possible that when using PWM, the eye is exposed to more light than a person is aware of, that it can somehow override, or "outperform" the body's reflexes?
2. My ears are in their late 30's, and although not as perceptive as they once were, they can still detect inductor whine on my Xtar WK21 if I hold it close to them. Dogs, and many other animals have much better hearing, and my second question is: It is obvious that dogs can detect inductor whine, and at frequencies that no human can hear, but is it possible that it is very annoying for them to listen to, or even painful? Most dogs would probably find a way to convey it to their owner if that were the case, but then again, it is possible that not all of them would. Perhaps the sound polluted-world we live in makes it a moot question, at least for dogs that live in the city, but if there is cause for concern I will consider using a single-mode light rather than one with PWM for dog walks in the future.