update* Ultrafire 501b torch - LumenJunkies respond

updated: 20th Nov. 2011~ see 'Additionally' onwards

As a follow-up to the preceding article

LumenJunkies.co.uk has just sent an email with a link to a time-lapse video they just made clarifying the life light-span of the ultrafire 501b that is certainly reassuring - and this effort, is also reassuring of their commitment to customer-service excellence.


"Just had a read of the review you posted, thanks for taking the time to do it.

I feel to you have somewhat unfairly judged the light based on the runtime you have experienced (mainly the comment about not expecting much extended runtime with the proper battery in place). I have done some testing with a fresh 18650 cell and produced a short video here for you”



Unbelievable.  Though, to be honest, what would be a good video would be one that gives attention to the glow as one can't tell the degree of dimming over the period of time indicated. 

Never mind.  You guys certainly deserve credit for the effort.  I'll post up the video with an update. 

And instead of returning the product for a refund, I'll appreciate it if you could just replace the internal single mode component with the originally-ordered multi-mode component.  I'll get the 18650 batteries from your site today.  I'll probably do a time lapse video thereafter in a dark room - with a small light focused on the watch - so that the viewer would be able to see, as mentioned above, the glow-degradation over time. 

Thanks again bro”


The above video does not indicate if the test was conducted at 'high', 'low', or 'medium' mode.  And as it was done in a well-lit room, one cannot appreciate the degree of dimming over time.

Without the consideration of the above points, i suppose the quality of the torch might come across as quite impressive.  But as this light will generally not be used in well-lit rooms, the  test in the video leaves much to be answered.  This is especially so, since my query with LJ was simply, '"How long does the light last at 'high' mode without significant dimming."  I'd still like to thank LJ for the effort, but the absence of this information renders the following video quite pointless.  Hope LJ can clarify.

LumenJunkies' response to above (additionally) points,

Hi Ed,

In response to the other questions - it was tested on a single mode bulb, so maximum output only (I think I put this in the video comments on YouTube?).

The timelapse worked by taking a photograph every 5 seconds then generating a video at 25fps. I was using an android app called time lapse on my phone, which whist has an 8mpx camera has no way to turn off auto light compensation. Meaning it tended to adjust according to the surrounding light, it was quite easy to overpower the camera totally if the beam was too close.. resulting in just a pure white photograph so thats why I opted for the beam to be pointed off camera.

The point of beam degradation is kind of moot anyway, the bulb is digitally regulated and not direct drive from the battery. Meaning that regardless of the voltage provided it tries to maintain a stable voltage to the LED. The result is little change in the beam until the battery gets flat enough to either cause the LED to flicker or just power down entirely. Its not like a normal filament bulb that will get dimmer and dimmer over time.

A note on consumer awareness,

At the end of the day, consumer awareness is a part of political consciousness, and can be deemed to be a stepping stone toward it since appreciating the 'justice of things' in our personal lives can be a step toward appreciating the justice of things in overarching socio-political arenas.

You could say that if one can't be an intelligent consumer, one will be nothing more than an irresponsible citizen.  You can even say that the degradation of consumer awareness is a signal of an impending degradation of popular political awareness.  When one of the two is affected, the other is affected over time.


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