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  1. #1
    I am a caffine girl colleen c's Avatar
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    Mini review of the Gemini Titan light with beamshot

    The Package

    I purchase a Gemini Titan Led light from Gemini. It wasn't so much that my Magic Shine has fail or anything like that but rather, I saw other reviews mentioned the reflector has more throw and better tint. So I bought one and decided to do a mini review of the light here. The total cost of the unit is $130 USD. This is higher than a MS900 but it does come with longer runtime battery, case, a blink mode that blink on/off instead of SOS or super fast blink, and a 1 year warranty. The downside is there's a no return policy.

    I placed the order on a Friday morning and the unit was in my mailbox by the following Wednesday afternoon here in the westcoast. Not too bad for a foreign shipping. The box and packaging is pretty much standard. There is an extension cable which is not in the picuture but was included in the package. Sorry, but some of the picutres may not be sized properly to fit on your screen, you may need to set your screen size or just scroll left/right to view the whole picture. Here is the unit:










    Here is a Magic Shine side by side for comparison, the MS900 is on the left:








    Couple of things I noted. The hooks for the O-Ring seem more thicker than the MS900. The cable and connector is almost identical to the MS. They are interchangeable with the battery pack. The strain relief is similar to the MS which means too many tugging on the connector will break the insulation. The switch cover feel better than the MS. I can take my nails and pry the cover off the switch but harder with the Titan. That same switch is slightly smaller and is recess in the housing more so than the MS. If you are wearing thick winter gloves, it might be harder to press the on switch.

    The next thing I done was a charge cycle and amoerage check before doing a runtime test.
    Last edited by colleen c; 01-07-11 at 11:00 PM.

  2. #2
    I am a caffine girl colleen c's Avatar
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    The bench Test

    The battery came shipped at 7.6 volts. I took the charger 2hr20m to charged to 8.27 volts before the green light came on. I noted the no load voltage of the charger was at 8.67v and was concern the pack will overcharged, but after several cycle, it tops off below 8.4 volts.The green indicator light was bright in both the red and green mode. I had no issue seeing the color of the led. I did noted the charger ran a little warm but not hot. There is a UL symbol on the charger but it wether it is real or not is unknown.

    After charging the battery I perform a amperage draw test. I was skeptical of the runtime claim of 4hr from a 5200 mah battery pack. I wanted to see if I can get some amp reading that might correspond to the runtime. I did the check several ways. I had several meter that I did an inline amp check along with a clamp on DC amp meter. I noted a reading of 1.3 amp draw and decide to perform another amp check with a 0.05 ohm 5 watt resister and checked the volt drop across it. The drop measure 65.9 mv which by ohms law, the unit draw 1.32 ma.









    I did the runtime test with a muffin fan blowing across the lamp head to cool it and here are the result showing the volt of the pack while it was still under the load of the lamp running on Hi mode.

    1hr 7.55v
    2hr 7.29v
    3hr 7.13v
    3.5hr 7.01v
    3hr45m 6.85v Indicator turn red on the on switch
    3hr55m 6.43v and the lamp went to Lo mode and that's when I stop the test.
    Last edited by colleen c; 01-07-11 at 10:39 PM.

  3. #3
    I am a caffine girl colleen c's Avatar
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    The beamshot

    I did the beamshot where the setting were the same. This is the indoor shot:



    The outdoor shot were done with the f stop at 4.0 with a shutter speed of 1.5 second and ISO 200. In these pictures, there are two set of tree on each side. The distant of the first set of tree iss 35ft and the second tree is 65ft. I took sample of each light aimed at the center, than at the tree. The last picture is with both set of light on, there is a dead spot where the beam did not cross but hard too see. Each shot has a "X" mark indicating where the aim were placed at.

    The tint on my 1 year old MS is more greenish while the Titan is white. The beam is tighter but has decent spread which I like but that is more a personal taste. I like the Titan for commute use because of the better throw but probably prefer a more flood like the MS for trail use.

    Each shot were using this setup. Each lamp head can be rotated vertically and horizontally as needed.













    Last edited by colleen c; 01-15-11 at 01:11 PM. Reason: corrected spelling in picture

  4. #4
    Senior Member pmseattle's Avatar
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    Thank you for a thorough, very scientific review ! Are you an electrical engineer ?

  5. #5
    I am a caffine girl colleen c's Avatar
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    Quote Originally Posted by pmseattle View Post
    Thank you for a thorough, very scientific review ! Are you an electrical engineer ?
    Should have been, but went to work to soon before finishing my college

    I traded an EE degree for a Mrs degree
    "Difference between a well dressed cyclist riding a two wheeled bicycle and a badly dressed cyclist riding a Recumbent is only a-tire"
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    Some people got their head so far up their butt such that the only thing they hear is muffle when trying to explain anything to them! I only wish they take it out sometimes to smell the roses.

  6. #6
    Cyclologist Plutonix's Avatar
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    1hr 7.55v
    2hr 7.29v
    3hr 7.13v
    3.5hr 7.01v
    3hr45m 6.85v Indicator turn red on the on switch
    3hr55m 6.43v and the lamp went to Lo mode and that's when I stop the test.
    Very nice review. I have one written up for another light but now I have photo-envy.

    Those are nice runtimes - longer than I expected from that pack. It seems like they made some internal refinements to the basic MS design as well as the larger capacity pack.

    Any idea what the resting voltage of the pack was after the test? 6.4V seems a bit aggressive on the drain. After a short rest and without a load it would have bounced back a bit which is the number most of us are used to seeing.

    Also, can you describe the blink/flash mode?

    Thanks again...
    Man does not live by one bike alone.
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  7. #7
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    Thanks for the review. The Gemini looks to be quite a nice little light. I like that it doesn't have a silly "assault crown".

  8. #8
    Senior Member no motor?'s Avatar
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    Nice review. The case for the Gemini looks pretty nice, even though most of us wouldn't use it. And speaking of using the new light, are you going to ad that to the lights you're already using or replace one?

  9. #9
    I am a caffine girl colleen c's Avatar
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    Quote Originally Posted by no motor? View Post
    Nice review. The case for the Gemini looks pretty nice, even though most of us wouldn't use it. And speaking of using the new light, are you going to ad that to the lights you're already using or replace one?
    Good question, the last couple of days, I alternated between the MS and the Titan using them by themselve, along with my other lights and just the MS plus Titan together. I think I will take off the MS light and replace it with the Titan light. It works better along my other lights which I have because the tint does not get washed out by the MG X Thrower. This will also tell me the water resistant of the light as I will be using it through foul weather.

    If I was to run the light alone, I'll pick the Titan. When I used to run the MS by itself, I notice how I was always trying to aim it higher as to attempt to get more throw. When I ran the Titan, the extra throw or maybe the better tint help got rid of that problem for me.

    Running a MS and a Titan side by side is not to bad of a pattern. The MS flood gave some extra lumination to the side at about 25ft out while the Titan throw out 25ft and beyond. From the handlebar to the first 15 to 25ft of distant, I cannot tell if the MS or is it the Titan that has the spillage.
    "Difference between a well dressed cyclist riding a two wheeled bicycle and a badly dressed cyclist riding a Recumbent is only a-tire"
    _______________________________________________________________________
    Some people got their head so far up their butt such that the only thing they hear is muffle when trying to explain anything to them! I only wish they take it out sometimes to smell the roses.

  10. #10
    I am a caffine girl colleen c's Avatar
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    Quote Originally Posted by MadCapsule View Post
    Thanks for the review. The Gemini looks to be quite a nice little light. I like that it doesn't have a silly "assault crown".
    Overall impression I got at looking at the two light is the Titan has a more professional tight look to it. The body also has less tapering to it. Hard to say, but that may help keep it cooler with the bigger body.
    "Difference between a well dressed cyclist riding a two wheeled bicycle and a badly dressed cyclist riding a Recumbent is only a-tire"
    _______________________________________________________________________
    Some people got their head so far up their butt such that the only thing they hear is muffle when trying to explain anything to them! I only wish they take it out sometimes to smell the roses.

  11. #11
    I am a caffine girl colleen c's Avatar
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    Quote Originally Posted by Plutonix View Post
    Very nice review. I have one written up for another light but now I have photo-envy.

    Those are nice runtimes - longer than I expected from that pack. It seems like they made some internal refinements to the basic MS design as well as the larger capacity pack.

    Any idea what the resting voltage of the pack was after the test? 6.4V seems a bit aggressive on the drain. After a short rest and without a load it would have bounced back a bit which is the number most of us are used to seeing.

    Also, can you describe the blink/flash mode?

    Thanks again...
    I recall letting the battery rested for 5 minute before plugging in the charger. I took a quick volt test and the pack did bounce back about 0.4 volt. It was almost back to about 6.9volts before I recharge it.

    It is so nice to have a "normal" blinkie on my light again, I almost feel like a normal bicyclist now instead of people staring back in their rear view mirror when I was right behind them with the SOS mode of the MS. I was wearing an older princeton headlamp with strobe mode to use during my afternoon commute which involve me riding right into the sunset and getting washed out. Now I don't need that on my helmet anymore.

    I just did a video of the blink mode:

    Last edited by colleen c; 01-08-11 at 11:14 AM.
    "Difference between a well dressed cyclist riding a two wheeled bicycle and a badly dressed cyclist riding a Recumbent is only a-tire"
    _______________________________________________________________________
    Some people got their head so far up their butt such that the only thing they hear is muffle when trying to explain anything to them! I only wish they take it out sometimes to smell the roses.

  12. #12
    Cyclologist Plutonix's Avatar
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    Thats a very reasonable flash rate. The pack is being discharged a little more deeply than I'd like (I have the opposite problem with the light I am testing - it is too conservative). I tried to find a data sheet for those batteries to see if maybe they had some info but not only arent there any data sheets online, but they dont list a 2600mah cell just a 2200. It may be fine for them now, but as it ages and the cells capacities get mismatched, it could be too much for them. I'd probably turn it off when it turns red to extend the service life of the pack, if nothing else.

    Overall, it looks like they are trying to counter many of the qualms some have regarding the MS. A better flash mode, better battery, better runtime, tint as well as cosmetics like the assault crown. The price doesnt seem horrible - its a bit more than a MS but the larger battery justifies a lot of that (in addition to the work to fix this and that).

    The UL mark on the charger is probably fake - it looks like the same charger sold with the Nova MS version. Lack of a US distributor, sparse water protection on the pack and fairly high shipping are the only other main cons I can see. Their rep seems to have shown a lot of poise too, given the number of questions liberally laden with skepticism and cynicism.

    Thanks again...
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  13. #13
    Super Moderator no1mad's Avatar
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    This might have been covered already in that other thread about the Gemini, but how long would it take to recharge?

  14. #14
    I am a caffine girl colleen c's Avatar
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    Quote Originally Posted by no1mad View Post
    This might have been covered already in that other thread about the Gemini, but how long would it take to recharge?
    Very good question. I had to terminate my charge cycle test when I got interupted to leave the house. Ended up finishing it later the next day then did the beamshot test the same day. The next time it gets discharge, I'm planing to do the charge time test and even take some temp measurment of the charger for the heck of it.

    I suspect it will take longer than the MS light since the Titan charger is rated at 1.0 amps and the MS is rated at 1.8 amps and it does have a larger battery pack. I'm guessing about 3.5 to 4.5 hours but that just a guess for now until I know for a fact.
    Last edited by colleen c; 01-08-11 at 01:35 PM. Reason: really bad spelling
    "Difference between a well dressed cyclist riding a two wheeled bicycle and a badly dressed cyclist riding a Recumbent is only a-tire"
    _______________________________________________________________________
    Some people got their head so far up their butt such that the only thing they hear is muffle when trying to explain anything to them! I only wish they take it out sometimes to smell the roses.

  15. #15
    I am a caffine girl colleen c's Avatar
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    Quote Originally Posted by Plutonix View Post
    Thats a very reasonable flash rate. The pack is being discharged a little more deeply than I'd like (I have the opposite problem with the light I am testing - it is too conservative). I tried to find a data sheet for those batteries to see if maybe they had some info but not only arent there any data sheets online, but they dont list a 2600mah cell just a 2200. It may be fine for them now, but as it ages and the cells capacities get mismatched, it could be too much for them. I'd probably turn it off when it turns red to extend the service life of the pack, if nothing else.
    According to their website, they will have a waterproof pack out. I'm waiting for that pack. There is a really good review at MTBR who the poster tored apart the pack and everything inside the pack looks much better in terms of quality. Even the PCB looks better protected from moisture. Vag provided the date sheet on the cells.

    Time will tell if this battery pack will remain balance or not. I suspect it may be better for several reasons. If the cell are better quality, than that may help. The light does have a lower load and it maybe better for the pack during discharge. The charger also is a slower charger at 1 amps. Does all these factor will help the balance of the pack? Don't know, but time will tell and so would the 1 year warranty
    "Difference between a well dressed cyclist riding a two wheeled bicycle and a badly dressed cyclist riding a Recumbent is only a-tire"
    _______________________________________________________________________
    Some people got their head so far up their butt such that the only thing they hear is muffle when trying to explain anything to them! I only wish they take it out sometimes to smell the roses.

  16. #16
    Cyclologist Plutonix's Avatar
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    I'd seen the MTBR dissection and thought the cells looked much better vs MS packs which have been opened to find a mix of 2000 and 2200 cells. The data sheet shows a low voltage of 3.0V +-.05.

    The 2 layers of PVC will work for road splash and many riders but all weather commuters, the English and similar will want more. But yea, the PCB seemed better protected by its location.

    The pics of the charger in the MTBR thread showed the charger with a 1800ma rate. Is yours different?
    Last edited by Plutonix; 01-08-11 at 05:33 PM.
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    Quote Originally Posted by colleen c View Post
    The bench Test
    I did noted the charger ran a little warm but not hot. There is a UL symbol on the charger but it wether it is real or not is unknown.
    How to spot a fake UL mark. Most fakes are really bad; if you post a good picture of the label, I can probably figure it out.

  18. #18
    I am a caffine girl colleen c's Avatar
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    Most likely fake and from the look of it, it is a generic Asia production charger. The label is one of those peel on/stick on type of label. Room for improvement for sure. The label is marked as 1 amp.
    Edit: It also appear to be a different charger as compare to the other review. Hmmmm???? QC?


    Last edited by colleen c; 01-08-11 at 03:32 PM.
    "Difference between a well dressed cyclist riding a two wheeled bicycle and a badly dressed cyclist riding a Recumbent is only a-tire"
    _______________________________________________________________________
    Some people got their head so far up their butt such that the only thing they hear is muffle when trying to explain anything to them! I only wish they take it out sometimes to smell the roses.

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    I'm really impressed with your review and the data you published.

    Thanks for taking the time.

  20. #20
    Cyclologist Plutonix's Avatar
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    Violates just about all the bullet points for fakes. I dont think it is a big deal - none of the chargers I have from cell to MP3, all purpose cell charger or even the LaCrosse charger have UL marks. That they would fake it says something though.

    I wonder if it is really 1A or just the sticker of the week? If true, it could take a while to charge.

    But be sure you heed the warning and Be use only at home! Not safe from an outlet at a friends house or motel!!!
    Last edited by Plutonix; 01-08-11 at 05:31 PM.
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  21. #21
    Old. Slow. Happy. MileHighMark's Avatar
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    Quote Originally Posted by Plutonix View Post
    But be sure you heed the warning and Be use only at home! Not safe from an outlet at a friends house or motel!!!
    Reminds me of the old ad in Mountain Bike Action with the tagline, "The more wonderful than you can imagine."
    GRAVELBIKE.COM - ride everything

  22. #22
    Zoom zoom zoom zoom bonk znomit's Avatar
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    Thats a false CE mark too.

  23. #23
    Senior Member socalrider's Avatar
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    It's amazing, 1 buyer - great review and houses are burning down crowd is already out in full force. Still waiting for 1 actual case of the charger - battery doing more than just getting warm to the touch.

  24. #24
    Zoom zoom zoom zoom bonk znomit's Avatar
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    Colleen are you able to measure the drive current to the LED? Reportedly its higher that the 2.4A MS but the battery runtime suggests otherwise.

  25. #25
    I am a caffine girl colleen c's Avatar
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    Quote Originally Posted by znomit View Post
    Colleen are you able to measure the drive current to the LED? Reportedly its higher that the 2.4A MS but the battery runtime suggests otherwise.
    When I did the inline current test with the Titan, I initally did not know what to say. So I also did a test with the MS900 light and that number came out to about 1.5 amps. I was thinking the PWM was driving my meter measurement nuts. So I end up doing the same test with the much more accurate Fluke meter and Simpson clamp on amp meter. Still I was not convince at how these number were so low for a P7 emmiter. That's when decided to do the V drop test with the resister inline and still came out with 1.3 for the Titan and 1.5 for the MS. The only thing I was not able to do was a dc CT wrap around doughnut test with an oscilliscope to see the driver pulse width because my CT were design to read 1000 amps and the MV out from the CT would have been to small to read.

    Then it occur to me that the thinking of 2.4 to 2.8 draw from a P7 was indeed true if it was running on a single 3.7 nominal 18650 cell. The pack for the MS and Titan are 7.4 nominal voltage and the driver will drive the LED with the same watts which mean now it will draw half the amps with twice the voltage from the power source. One of my picture show the volts under load was 7.5v with a load of 1.4 amps. Given that data, the light was drawing 10.5 watts which is about right for the light output of a P7 at that consumption. It kinda then make sense to me and I think I was wrong earlier when I posted to Gemini about getting the runtime they claim from the light as being doubtful because of the 2+ amps draw of a P7.

    Another point of view is the size of a MS pack. It is rated for 4.4 amp hr (4400 mah). If a MS did draw 2.4 amps, than that battery will only last 1hr 50min, but yet we get 3hrs of runtime from the pack when they were new. Backward math here shows that a 4.4 Ahr pack will last 3 hrs if the load draw about 1.5 amps which happens to be my finding of the current draw when I did the similar test with a MS900 lamp.

    I hope what I posted is correct, but the math seem correct.........(I think)

    Edit: I'm not sure what will be the current right at the Led, this might indeed be different than the load current from the battery depending on how the driver regulation works. It may maintain the same wattage draw from the battery but lower the volt which mean higher current at the emitter than I am reading from the battery.
    Last edited by colleen c; 01-08-11 at 09:29 PM.
    "Difference between a well dressed cyclist riding a two wheeled bicycle and a badly dressed cyclist riding a Recumbent is only a-tire"
    _______________________________________________________________________
    Some people got their head so far up their butt such that the only thing they hear is muffle when trying to explain anything to them! I only wish they take it out sometimes to smell the roses.

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