Advertise on Bikeforums.net



User Tag List

Results 1 to 10 of 10
  1. #1
    Senior Member highroller's Avatar
    Join Date
    Dec 2008
    Location
    Tour Down Under
    Posts
    70
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Cree XML T6 vs SSC P7?

    Im thinking of purchasing a bike light. Which of these LED is better T6 or P7?

  2. #2
    Zoom zoom zoom zoom bonk znomit's Avatar
    Join Date
    Sep 2006
    Location
    New Zealand
    My Bikes
    Giant Defy Composite,Trek 1.7c, Specy Hardrock, Nishiki SL1, Jamis Commuter
    Posts
    2,849
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    XMLs are significantly better than the P7s

  3. #3
    Senior Member dave5339's Avatar
    Join Date
    Mar 2004
    Location
    North of the DFW MetroMess
    My Bikes
    Bacchetta Giro 700C, Rans Seavo tandem, Giant OCR-2 & a Specialized Rockhopper
    Posts
    92
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    XML hands down.

    Semper Fi

  4. #4
    Senior Member Richard Cranium's Avatar
    Join Date
    Jun 2002
    Location
    Deep in the Shawnee Forest
    My Bikes
    LeMond - Gunnar
    Posts
    2,786
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Yeah - and I want to know when the "next big thing" is coming in LEDs

    Is there any kind of "lot code" or other changes yet in the Cree "XM-?" line up?

    I know there is more than one version...... is there a good CP thread? or some article you guys know about?
    Sorry about my comments - I thought you wanted honest feedback.
    2003 Lemond Wayzata - 2002 LeMond Malliot Jeune

  5. #5
    Randomhead
    Join Date
    Aug 2008
    Location
    Happy Valley, Pennsylvania
    Posts
    12,548
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    there is always something new. They have come out with the XT-E and XB-D. I think the only way to really keep up is to read the Cree site occasionally. CPF also has a forum about emitters where they obsess over them. I never really saw much reason to worry about keeping up too closely. XM-L is a big step up over a P7 or an MC-E, but they all have their places.

  6. #6
    Senior Member
    Join Date
    Jun 2011
    Location
    Austin, Texas
    My Bikes
    Unidentifiable CX-based franken-commuter
    Posts
    158
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Not all LEDs of one "model" are created equal. The "base model" you're discussing is the XM-L, but when CREE manufactures them some end up being relatively brighter and some dimmer. They separate these during post-production testing into "bins", T3, T4, T5, T6 for XM-L. There is also at present a U2 available which is about 7% brighter for the same current/voltage, but it has limited availability. A few high-end flashlights come with them, and you can get the emitter + board from Cutter Electronics, but I don't know of any bike lights with them.
    Here's a reference for quickly comparing different LED's. They also have pages for other manufacturers.
    http://flashlightwiki.com/Cree
    The newly-released XT-E ad XB-D lights have lower current limits than the XM-L. While they are brighter at lower currents, if you're using a single LED you can get more light overall out of an XM-L. If you're using 2 or 3 LEDs, using these smaller, much cheaper LED's can be more cost- and power- effective, as well as enabling a more tightly focused beam. But at present, there's nothing in the immediate future to supersede the XM-L.

  7. #7
    Certified Bike Brat Burton's Avatar
    Join Date
    Jan 2011
    Location
    Montreal, Quebec
    Posts
    4,203
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Regardless of which one is a 'better' LED, its the design and build quality of the driver assembly, heat sink housing, weatherproofing and power supply that determines if you end up with a light worth buying. I personally wouldn't buy a car based simply on how many cylinders the engine had and lights aren't much different.

  8. #8
    Zoom zoom zoom zoom bonk znomit's Avatar
    Join Date
    Sep 2006
    Location
    New Zealand
    My Bikes
    Giant Defy Composite,Trek 1.7c, Specy Hardrock, Nishiki SL1, Jamis Commuter
    Posts
    2,849
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Burton View Post
    I personally wouldn't buy a car based simply on how many cylinders the engine had and lights aren't much different.
    I personally wouldn't buy an otherwise nice car with a [insert your own expletive here] engine.

  9. #9
    Senior Member a1penguin's Avatar
    Join Date
    Jun 2009
    Location
    Silicon Valley, CA
    My Bikes
    2012 Trek 7.5 FX DISC, 2002 Trek 2200 WSD, 1997 Specialized Rockhopper Al Comp
    Posts
    2,057
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    CPF? Why not budgetlightforum.com? You'll find out when the affordable flashlights are available. Your best bet for off the shelf flashlight is going to be XM-L.
    2012 Cannondale Synapse 3, 2012 Trek 7.5 FX Disc, 2003 Trek 2200 WSD, 1997 Specialized Rockhopper Al Comp

  10. #10
    Certified Bike Brat Burton's Avatar
    Join Date
    Jan 2011
    Location
    Montreal, Quebec
    Posts
    4,203
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by znomit View Post
    I personally wouldn't buy an otherwise nice car with a [insert your own expletive here] engine.
    Is there such a thing? Currently the only decent cars I'm personally aware of that might have engine issues would be USED cars.

    Lights, on the other hand, can have a wide range if quality depending on who builds them regardless of what LED was used.

    http://www.pcmus.com/Dive-Photos/High-Power-LED.htm

    On this page, for example, I'm not seeing any earth shattering advantages of one type over another. Except possible the ability to build in series An 'advantage' that can be completely negated by the design and build quality of the lens and driver assembly, heat sink housing, weatherproofing and power supply as already stated.

    I'm running P7's myself and it was a deliberate choice in spite of whatever else is available. Price wasn't any part of that decision.

    My own experience has been that 'bargin basement' lights are more likely to have issues - regardless of LED type used.
    Last edited by Burton; 04-30-12 at 07:34 AM.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •