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Thread: Surefire L4 170 lumen Output?

  1. #1
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    Default Surefire L4 170 lumen Output?

    I recently saw a SF L4 in the new packaging with an advertised 170 lumen output. The last iteration of L4 was 120 lumens with a SSC P4 emitter. Is this a case of a more realistic estimation of lumens with no change in the light (i.e., the 120 lumens was an underestimation) or did something change? The "useful" runtime is still advertised to be the same (5.5 hours).

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    Flashaholic* 880arm's Avatar
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    Default Re: Surefire L4 170 lumen Output?

    Based upon my samples (only one of each) they are very nearly the same. The emitters look identical to me and the heads are identical other than the serial number on the newer KL4 begins with a C as opposed to the B on the older one.

    The beam of the newer one is very noticeably warmer than the older one and the output, measured with my cheap-o lux meter, is about 20% greater. This could be well within the range of manufacturing variance combined with my sampling margin of error. Tailcap current is about the same.

    I'm only guessing but I suspect the increase is at least partly due to underrating the older ones and maybe a differently binned emitter.

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    Default Re: Surefire L4 170 lumen Output?

    Quote Originally Posted by 880arm View Post
    Based upon my samples (only one of each) they are very nearly the same. The emitters look identical to me and the heads are identical other than the serial number on the newer KL4 begins with a C as opposed to the B on the older one.

    The beam of the newer one is very noticeably warmer than the older one and the output, measured with my cheap-o lux meter, is about 20% greater. This could be well within the range of manufacturing variance combined with my sampling margin of error. Tailcap current is about the same.

    I'm only guessing but I suspect the increase is at least partly due to underrating the older ones and maybe a differently binned emitter.
    I thought maybe SF had upgraded to a XP-G emitter, but if the emitters look identical, then I guess not. Thanks!

  4. #4

    Default Re: Surefire L4 170 lumen Output?

    seems strange that Surefire wouldn't update the specs on their site?

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    Flashaholic* 880arm's Avatar
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    Default Re: Surefire L4 170 lumen Output?

    Quote Originally Posted by Espionage Studio View Post
    seems strange that Surefire wouldn't update the specs on their site?
    I thought the same thing. The box isn't even updated, it just has a 170 lumens stickers on top of the 120 lumens printing. The paperwork has a revision date of June, 2012 and shows the 170 lumen rating.

  6. #6

    Default Re: Surefire L4 170 lumen Output?

    Quote Originally Posted by Espionage Studio View Post
    seems strange that Surefire wouldn't update the specs on their site?
    Maybe to give their dealers a chance to clear out their older 120 lumen stock? It is pretty crazy, the first I saw the 170 lumen version was in the marketplace, and when you Googled it nothing came up until this thread.

  7. #7

    Default Re: Surefire L4 170 lumen Output?

    I have had the 120 Lumen one for years and loved it. After seeing a few of the 170 lumen version for sale on a few boards, I was unable to find any info on it like everyone else. A seller on Ebay had several for $75 USD so I bought one, I was going to buy 2 but I was unsure of what to expect from the output. After receiving it I was really impressed, noticed a brighter white and tighter hot spot verses the older one where it had a greenish flood type output. After seeing the output I wish I did buy another but they are sold out. It is a great everyday carry light imo.




    Newer ones appear the have a "C" in the serial number




    From about 4 feet away
    Last edited by PowershipMC; 10-10-2012 at 12:46 PM.

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    Default Re: Surefire L4 170 lumen Output?

    Quote Originally Posted by PowershipMC View Post
    I have had the 120 Lumen one for years and loved it. After seeing a few of the 170 lumen version for sale on a few boards, I was unable to find any info on it like everyone else. A seller on Ebay had several for $75 USD so I bought one, I was going to buy 2 but I was unsure of what to expect from the output. After receiving it I was really impressed, noticed a brighter white and tighter hot spot verses the older one where it had a greenish flood type output. After seeing the output I wish I did buy another but they are sold out. It is a great everyday carry light imo.
    Thanks. The 120 lumen L4 that I have has a tight hot spot and white tint ... not at all like the floody LuxV predecessor. The emitters between both (120 lumen and 170 lumen) are P4s.

    Thanks for the pics!

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    *Flashaholic* Illum's Avatar
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    Default Re: Surefire L4 170 lumen Output?

    Okay...
    Prefix A = LuxV 60lm
    Prefix B = SSC 120lm
    Prefix C = SSC 170lm

    So one way to see the change would be to post two L4s, one B one C side by side. A difference in brightness will confirm the presence of a new driver and not just a spec readjustment

    EDIT: Turns out the C series of L4s uses a SSC LED with much more phosphor coating resulting in a yellowish output with a slight purple hue in the middle.
    B on left C on right




    Now heres the difference
    B on right C on left


    I misplaced my multimeter, so no current readings was made
    Last edited by Illum; 10-19-2012 at 03:52 PM.

  10. #10

    Default Re: Surefire L4 170 lumen Output?

    Quote Originally Posted by Illum View Post
    Okay...
    Prefix A = LuxV 60lm
    Prefix B = SSC 120lm
    Prefix C = SSC 170lm

    So one way to see the change would be to post two L4s, one B one C side by side. A difference in brightness will confirm the presence of a new driver and not just a spec readjustment


    More Pics... New L4 on left, Old "A" L4 on Right. Both have new batteries. I do not have a "B" Version.

    Last edited by PowershipMC; 10-10-2012 at 04:29 PM.

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    Default Re: Surefire L4 170 lumen Output?

    Quote Originally Posted by Illum View Post
    Okay...
    Prefix A = LuxV 60lm
    Prefix B = SSC 120lm
    Prefix C = SSC 170lm

    So one way to see the change would be to post two L4s, one B one C side by side. A difference in brightness will confirm the presence of a new driver and not just a spec readjustment
    Regarding B and C, they both have the same runtime, and post 2 said that the tailcap current was approx. the same between the two. I'm thinking a spec readjustment, but I could be wrong.

  12. #12
    Flashaholic It01Firefox's Avatar
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    Default Re: Surefire L4 170 lumen Output?

    I have an L4 with a B head that I purchased in May and I just got one of the 170 lumens C heads and the beam shape, color and intensity is exactly the same.

  13. #13

    Default SUREFIRE L4 LUMAMAX

    A couple of weeks ago my wife told me that she needed a good portable flashlight to use when she does night photography. Since I had a very serviceable Surefire 6PX (200 Lumen power), I decided to give that to her along with the leather holster and take the opportunity to shop for a new light. For some time I have had my eyes on one of the Surefire models with a detachable head, in particular an A2 or an E2. After some research, I saw that the L4 was recently upgraded to a 170 Lumen head and I had a chance to get one for a reasonable price NIB. A few days ago my new lamp showed up at the doorstep, just in time for a field trip. Luckily, it fit very well in my old mini-maglite leather belt holster. The fit and finish of the L4 light is excellent. I partucularly appreciate the knurling on the body as well as the belt clip to which you can atttach a lanyard. My old light lacked these details. Tthe intensity of the light is very nearly the same as that of the 6PX. After using it in the field for several days, I am very satisfied with the purchase. Surefire lights are not cheap but they certainly are well made.

  14. #14
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    Default Re: SUREFIRE L4 LUMAMAX

    I am not seeing a 170 lumen L4 when doing a google search. Don't usually ask for links from new members, but please supply one for this 170 lumen L4.

    Bill

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    Default Re: SUREFIRE L4 LUMAMAX

    Quote Originally Posted by Bullzeyebill View Post
    I am not seeing a 170 lumen L4 when doing a google search. Don't usually ask for links from new members, but please supply one for this 170 lumen L4.

    Bill
    I found these links plus I see them on EBAY.

    http://www.candlepowerforums.com/vb/...0-lumen-Output
    http://www.cpfmarketplace.com/mp/sho...on!-price-drop

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    Retired Administrator Norm's Avatar
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    Default Re: SUREFIRE L4 LUMAMAX

    Thread Merge - Norm

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    Flashaholic yearnslow's Avatar
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    Default Re: SUREFIRE L4 LUMAMAX

    I suspected my C2L KX4 was more than 120 lumens. It has the same emitter as the L4 yes?

  18. #18
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    Default Re: SUREFIRE L4 LUMAMAX

    Quote Originally Posted by Bullzeyebill View Post
    I am not seeing a 170 lumen L4 when doing a google search. Don't usually ask for links from new members, but please supply one for this 170 lumen L4.

    Bill
    Bill, the new red packaging for the L4 states 170 lumens. Appears to just be a more realistic indication of output instead of an understated 120 lumens.

  19. #19
    Flashaholic* Eric242's Avatar
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    Default Re: SUREFIRE L4 LUMAMAX

    Quote Originally Posted by Bullzeyebill View Post
    I am not seeing a 170 lumen L4 when doing a google search. Don't usually ask for links from new members, but please supply one for this 170 lumen L4.
    Surefire tuned it up to 170 lumens a while ago. Here´s a picture of the box of my L4 I just sold a few days ago:



    Eric
    Last edited by Eric242; 04-20-2013 at 09:36 AM.
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  20. #20
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    Default Re: SUREFIRE L4 LUMAMAX

    Thanks guys, my googling did not show a 170 L4. Glad to see that they upgraded it. I wonder if they changed to another LED?

    Bill

  21. #21

    Default Re: Surefire L4 170 lumen Output?

    Bill,
    I also did a web search before purchasing my new L4 and did not unearth much info. I purchased my L4 (170 lumen) from a well known auction site. If you were to do a search on the site you will see a number of L4 models, some of which are adverstised as 120 lumen and some as 170 lumen. There are also some L4's which do not have the lumen value listed. If you order from this site, I recommend that you specify that you would like to receive the 170 lumen model and not the older model. The person that I purchased the light from NIB stated that she would send the newer 170 lumen model to those who specified that they wanted the upgraded model. Otherwise she would send the older model NIB. The box had a sticker specifying the higher, 170 lumen value. Although the rated strength is a bit less than my 6PX, I am very satisifed with the beam quality and the build quality. I am sure that it will serve me well for a number of years.

    Regards,
    Foxdoublegunner

  22. #22
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    Default Re: Surefire L4 170 lumen Output?

    I know this is an old thread, but wasn't there a version of the L4 that used a Cree emitter? Or at least a KL4 head for one of the weapon lights that had a Cree?

  23. #23

    Default Re: Surefire L4 170 lumen Output?

    Quote Originally Posted by tjhabak View Post
    I know this is an old thread, but wasn't there a version of the L4 that used a Cree emitter? Or at least a KL4 head for one of the weapon lights that had a Cree?
    I think the newer Cree ones are KX1, KX2 etc. On the KL4 I think SSCP4 is the latest available.

    I did however have had such KL4 (170lm version) gone thru an XPG2 (S5 flux) swap, courtesy of Lumens Factory. The results are great, even though the hotspot is not tightly focused.

    My question, however, is: what's the input voltage range of the KL4 (SSCP4 170lm, buck driver)? I've tried RCR123a and while it works, I've been advised not to because 2x3.7V input is not on its official specs. Also what's the drive current of the stock KL4?

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