Matt, you have no idea what you're talking about. Let correct what you think...I think, BTW, that they had to use PWM to provide the very low low that CPF likes to have so much because CC drivers cannot have such broad input/output variability.
...Regarding efficiency, PWM is very efficient. I think most people aren't aware of this but pretty much all types of real regulation use PWM to some extent because it is such an effective, efficient method.
Matt, you have no idea what you're talking about. Let correct what you think
1. There are plenty of examples of CC drivers that can drive as low or even lower. There's one in the works that does 1ma and will power lights for over a month easily.
2. PWM is NOT very efficient. PWM is only as efficient as the 100% cycle. Of the entire driving current range, the MOST inefficient is the maximum driving power. So even though your PWM is at say 1%, your efficiency is at best as efficient the highest driving range.
Example: an LED driven at 25ma achieves 150 lumens per watt. The same LED driven at 1000ma is 70 lumens per watt. If you drive a light at 1000ma and 100% or 1% PWM, the efficiency remains at 70 lumens per watt.
In fact, it's less efficiency than 100% due to switching losses. Imagine
if you drive a car by only flooring the throttle and completely letting off the throttle. You can modulate the throttle and acheve the speed you want but your miles per gallon is going to STINK.
You know what I think?
You're just justifying PWM because it's a product that you sell.
Come to think of it, those two points I quoted you contradict themselves.
Actually I have been known to post AGAINST products that I sell - see my post history - this case included (yes I carry the m30 as well)David, with all due respect, I've no doubt that your facts about PWM are correct, but I don't remember you pointing them out with such relish in the past when your Sales Threads were also for lights with PWM like the Fenix L0D and the P1D, for example.
Its only natural for Dealers to defend/hype their products and I don't think you have ever been immune from that.
Its also up to us CPFers to realize when there's a vested interest and to do our own independent research.
Actually I have been known to post AGAINST products that I sell - see my post history - this case included (yes I carry the m30 as well)
My interest is in disseminating the truth so people can decide for themselves. If there is something that's not true don't you think it should be pointed out? People can be easily-mis-led!
By the way, yes l0d is pwm but the p1d has always been constant current.
The tk40 has serious issues due to it's use of aa batteries due to the possibility of reverse charging a weaker cell. The m2 is head heavy and cumbersome. I'm just telling you the truth.I'm all for getting at the truth as you've probably seen from numerous posts of mine.
Whether I actually achieve that or not is probably very questionable.
I'm also very interested in what motivates people to write certain things because sometimes there's a broader truth in that too.
Perhaps you carry the M30, but perhaps you have higher stakes in the Fenix TK40 and the Eagletacs M2 and M2X.
The tk40 has serious issues due to it's use of aa batteries due to the possibility of reverse charging a weaker cell. The m2 is head heavy and cumbersome. I'm just telling you the truth.
Pwm is pwm. Cc is cc. Facts need to be straight before people can make an educated choice.
Ok, you sound convincing enough. :nana:
It seems to me that each of the quad-die mass produced lights have pros and cons and that there's no clear winner or loser.
Its really depends on what set of pros and cons present the most favorable combination for the user.
Ok, I admit I came on strong and I assumed that Matt knew otherwise and intentionally misled people. I do not know that and I apologize. I should have assumed the better and just stated the facts and stopped there.Well, I think the last few posts highlight the fact that it's often not what we say, but how we say it that triggers a response.
Sort of like tint. Depending on what you were just exposed to, it might look blue, or green, or yellow. The truth of what it was remained constant, but our perception differs substantially.
I watch the movie.
I stated that M30 is not a dedicated thrower, it's more like a flooder.
But as a every day use light.( I like it when it lit the room)
can any one help me pick which torch is for dedicated thrower?
is TK40 or M1X good?
thanks before.
Pwm is pwm. Cc is cc. Facts need to be straight before people can make an educated choice.