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Thread: LUX RATINGS - RC40 vs TK70

  1. #1

    Default LUX RATINGS - RC40 vs TK70

    Looking at the factory ANSI specs of both lights, the TK70 has 130,500cd intensity, 720m distance, 2200 lumens

    RC40 has 126,000cd intensity, 710m distance, 3500 lumens

    So theoretically, both lights will throw just about the same to .25lux, but where does the difference of 1300 lumens go, to the spill of the RC40?
    Last edited by tatasal; 03-29-2013 at 02:11 AM.

  2. #2
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    Default Re: LUX RATINGS - RC40 vs TK70

    RC40 could have wider hotspot.

  3. #3

    Default Re: LUX RATINGS - RC40 vs TK70

    Yeah, you could have differences in the hot spots, coronas and spill, in any proportion.

    I'd be surprised if say ALL went to spill, as the spill is only the light that misses being focused...and its more likely that the extra 1,300 L went primarily into the SIZE of the hot spot and/or corona.

  4. #4
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    Default Re: LUX RATINGS - RC40 vs TK70

    Quote Originally Posted by TEEJ View Post

    I'd be surprised if say ALL went to spill, as the spill is only the light that misses being focused...and its more likely that the extra 1,300 L went primarily into the SIZE of the hot spot and/or corona.
    Exactly! The TK70 has more in common with my SR90 beam profile than it does the RC40. The hotspot appears about 50% larger from the RC40 but with the same peak lux.

  5. #5

    Default Re: LUX RATINGS - RC40 vs TK70

    Quote Originally Posted by Patriot View Post
    Exactly! The TK70 has more in common with my SR90 beam profile than it does the RC40. The hotspot appears about 50% larger from the RC40 but with the same peak lux.
    Looking at the increase of 1,300 lumens spread over a wide area in the RC40's hotspot seems, to me, not a substantial upgrade from a TK70. Oh well, maybe I'll wait for another 1,300 lumen additional increase.

    Taking into consideration the current RC40's price, it's kind of stiff, as it is about the total of a TK70 AND TK75 combined price!
    Last edited by tatasal; 03-29-2013 at 07:35 PM.

  6. #6

    Default Re: LUX RATINGS - RC40 vs TK70

    Yeah, the hotspot on the rc40 is pretty darn big, especially compared to lights like the olight sr-series. Here is a good video I found comparing several lights (including rc40) at around 100m:
    http://www.youtube.com/watch?v=VnrmuWcwzbM
    Last edited by razer1000; 04-15-2013 at 11:32 AM.

  7. #7

    Default Re: LUX RATINGS - RC40 vs TK70

    Quote Originally Posted by razer1000 View Post
    Yeah, the hotspot on the rc40 is pretty darn big, especially compared to lights like the olight sr-series. Here is a good video I found comparing several lights (including rc40) at around 100m:
    http://www.youtube.com/watch?v=VnrmuWcwzbM
    2 posts above you is the maker of that video LOL. Thanks patriot for all of your reviews and videos on these high powered lights. I haven't bought any you have reviewed but it has helped push me to the TN31mb which is what I was looking for as far as throw. I think the TM26 might be next on the list. Thanks again!

  8. #8
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    Default Re: LUX RATINGS - RC40 vs TK70

    Quote Originally Posted by lintonindy View Post
    2 posts above you is the maker of that video LOL. Thanks patriot for all of your reviews and videos on these high powered lights.

    No problem lintonindy! I've enjoyed making them and sharing with you guys!

  9. #9

    Default Re: LUX RATINGS - RC40 vs TK70

    My TK70 can't reach 130kcd at all, always around 107kcd to 110kcd.
    Below is the measurement of my RC40. She is way above 3500 lumens.

    http://www.candlepowerforums.com/vb/...40-Measurement

  10. #10

    Default Re: LUX RATINGS - RC40 vs TK70

    If you measure the TK70 at 3 meters, its too close for beam convergence, and you'll get a low cd number.

    Also, remember that the ANSI ratings are based on only THREE total samples, and that LEDs range in performance as much as +/- 15%.

    So, if one of us takes ONE measurement, of one light, statistically, its less likely to represent the entire model line except by chance.

    A +/-15% range is therefore a way to ball park the performance, so that if a light is supposed to be 8,000 lumens, and we get 4,000 L, we can be pretty sure its not due to random batch variations...but if we get 6,800 L, or 9,200 L, we might figue that the claimed 8,000 L could be reasonable.


    That means your TK70 might be in spec, or low, or high, and, so could your RC40, etc. It doesn't mean some other guy's version of your light puts out the same as yours does. Sometimes you get the runt of the litter, and some times you get the pick of the litter, etc.



    At Photon Fest 18 for example, my TK70 measured ~ 2,800 L, over spec, but, some others measured were on the lower side, etc. You just need to see it as YOUR light's specs vs the MODEL's specs.


  11. #11

    Default Re: LUX RATINGS - RC40 vs TK70

    My TK70 output is not obviously low, very close to S6330 and my other light. So I estimated her output is about or above 2200lm as advertised. Now just the peak intensity is in question and I read before online quite a few people reported low peak intensity of TK70. 3 meter should be far enough for peak intensity measurement, it depends on the effective diameter of reflector. I will try distance of 6m to see any huge differences. Thanks.

  12. #12

    Default Re: LUX RATINGS - RC40 vs TK70

    Yeah I was hoping to find some good beamshot comparisons between the TK 70 and the RC 40 but only found one person who had any. I guess I deal better in video form. I use the TK 41 and 70 nightly at work and ordered the RC 40 yesterday. I'll either have to sell the RC 40 or the other two lights when I decide which will be more ideal for me. I'm thinking the RC40 will be best, but I know I'll get tired of holding that thing up over my head all night long. That's the main reason I end up switching over to the TK41 after enough hours with the TK70.

    It also seems that Fenix has pulled production on the TK70. I don't see it on their website anymore.

  13. #13

    Default Re: LUX RATINGS - RC40 vs TK70

    Quote Originally Posted by DENGOH View Post
    My TK70 can't reach 130kcd at all, always around 107kcd to 110kcd.
    Below is the measurement of my RC40. She is way above 3500 lumens.

    http://www.candlepowerforums.com/vb/...40-Measurement
    Saablaster has tested one TK70 at 114Kcd.

  14. #14

    Default Re: LUX RATINGS - RC40 vs TK70

    Hi, I finally tried 6m last week. And measurement doesn't change much, should say remain the same. Some light get higher, some get lower number.
    I am sure 3m is enough for many flashlights unless we are talking about very huge diameter reflector.

    http://www.candlepowerforums.com/vb/...40-Measurement

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