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Daniel B
Joined: 08 Mar 2006
Posts: 1544
Location: Berkshire, United Kingdom
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 Posted Sun Nov 8, 2009 6:20 pm |
Can I ask a question?
After seeing another post about best offer buys, I had a look on there at P7's, and the only obvious downside seems to be that the ones I have looked at have no reviews.
This one caught my eye:
http://www.bestofferbuy.com/mte-sf15-ssc-p7dsxo-4mode-memory-900lumen-led-flashlight-118650-p-26262.html
The main reason it caught my eye is I think it is marginally cheaper than the tw P7's from DX, but also it seems to be 1cm shorter, so nice and, or rather more compact than the usual suspects.
Am I missing something, is there anything that makes it clearly inferior to the DX offerings?
Is it maybe not waterproof or lacking in some other area??
Cheers
Dan
Felt F70 05 FCN3
Delta 09
Marin Palisades Trail 91
Marin Palisades Trail 06
Marin Highway One 05
Carrera Subway One 05 FCN10 |
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Turveyd38
Joined: 29 Jan 2009
Posts: 311
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Posted Sun Nov 8, 2009 7:43 pm |
Moggys got 1 of these, it's different to the DX SF15 really bright, bigger reflector than the DX 1 so its less floody and adds a better range punch, very neutral white aswell which I like.
Nice torch for bar mounting, not focused enough for head useage for me possibly to big / heavy also.
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supersonicLives Here
Joined: 25 Nov 2005
Posts: 47998
Location: Chapeltown, Sheffield
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Posted Sun Nov 8, 2009 9:14 pm |
Another note on lumens is that the LED lumens and torch lumens out the front are different - the latter always less due to optically losses.
Also max quoted efficiency x max input voltage does not always equate to the max lumens for the LED.
Zaskar LE 1996
Zaskar Carbon Team
MYSPACE |
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moggy82
Joined: 20 Feb 2005
Posts: 330
Location: United Kingdom
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Posted Sun Nov 8, 2009 9:54 pm |
| supersonic wrote: | Another note on lumens is that the LED lumens and torch lumens out the front are different - the latter always less due to optically losses.
Also max quoted efficiency x max input voltage does not always equate to the max lumens for the LED. |
Thats right max efficiency tends to be at 350mA, where its still close at 700mA, but as you go over this the lumens per watt drops quite a bit, with 1000mA being the normal cut off point, however some are driven at 1200mA. E.g 250/3.6x1 = 69.5 lumens per watt
and 280/3.6*1.2 = 64.8 lumens per watt. (Lumens / Voltage in * Amps). You can see that over driving a led will get more output but becomes less efficient as more heat is generated.
| Turveyd38 wrote: | Moggys got 1 of these, it's different to the DX SF15 really bright, bigger reflector than the DX 1 so its less floody and adds a better range punch, very neutral white aswell which I like.
Nice torch for bar mounting, not focused enough for head useage for me possibly to big / heavy also. |
The best Buy version is a MTE forgery, about 50% heavier and 1inch longer. Got a nice beam pattern though, but the DX one is more floody! DX is better for the bars in my opinion, but Turvey likes the beam on this one. despite its overall size difference.
http://moggy82.pinkbike.com/album/lights-and-beam-pics-etc/ |
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prawny
Joined: 26 Nov 2008
Posts: 1651
Location: Cannock Chase
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Posted Sun Nov 8, 2009 10:06 pm |
Oh joy! Just tested my Magicshine out on the road over the chase, feck me on full power I was riding at daylight speed on my road bike on completely unlit roads with total confidence. Seriously recommended for £50.
Infact I might get another one and rock them both off road, although i'd be worried the beams would start a forest fire.
FCN 9 - Saracen Dirttrax Disc
FCN 5 - Boardman Road Comp |
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supersonicLives Here
Joined: 25 Nov 2005
Posts: 47998
Location: Chapeltown, Sheffield
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Daniel B
Joined: 08 Mar 2006
Posts: 1544
Location: Berkshire, United Kingdom
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Posted Mon Nov 9, 2009 8:22 am |
| moggy82 wrote: |
The best Buy version is a MTE forgery, about 50% heavier and 1inch longer. Got a nice beam pattern though, but the DX one is more floody! DX is better for the bars in my opinion, but Turvey likes the beam on this one. despite its overall size difference. |
Blimey, thankyou for the heads up, will steer well clear!
Dan
Felt F70 05 FCN3
Delta 09
Marin Palisades Trail 91
Marin Palisades Trail 06
Marin Highway One 05
Carrera Subway One 05 FCN10 |
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moggy82
Joined: 20 Feb 2005
Posts: 330
Location: United Kingdom
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diy
Joined: 14 Sep 2009
Posts: 360
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Posted Mon Nov 9, 2009 11:14 am |
Who cares if they copies - as long as the chips are genuine the rest of the product is essentially a tube, switch and reflector. They're are different beam versions - the budget unit is very spot focus. SF-15 (D-Bin), the C-bin is more floody. But for the price difference you can get a 501b (almost) as an addition They are all copies of copies anyway.. I really think these are all sourced from the same factory.
Also unless I have got the sums wrong. You can't run a 2.8A driver for 2.5 hours with a 2.6Ah cell. - reckon you'd get more like 45 minutes..
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moggy82
Joined: 20 Feb 2005
Posts: 330
Location: United Kingdom
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Posted Mon Nov 9, 2009 11:28 am |
Its a bad copy, as its not the same size, output, no memory on the modes, the quality is a lot lower than the genuine MTE one! Its just a warning as people will see the spec and size of this and think whoa that looks nice as in the first post on this page. But the product they recieve will look similar but not be what they were expecting. BOB have asked for comparison photo's so once i have took them later i'll post on here so you can see what i mean!
Most P7's are driven at 2000 - 2500mA although quoted as 2.8A and last 60-75 mins to 50% output. I have never had one last less than 60 mins and i have had quite a few.
http://moggy82.pinkbike.com/album/lights-and-beam-pics-etc/ |
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handful
Joined: 17 Sep 2008
Posts: 163
Location: Somerset
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moggy82
Joined: 20 Feb 2005
Posts: 330
Location: United Kingdom
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handful
Joined: 17 Sep 2008
Posts: 163
Location: Somerset
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moggy82
Joined: 20 Feb 2005
Posts: 330
Location: United Kingdom
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handful
Joined: 17 Sep 2008
Posts: 163
Location: Somerset
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-Basic-
Joined: 14 Oct 2009
Posts: 1
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Posted Mon Nov 9, 2009 1:59 pm |
Can someone with some technical knowledge help me?
I got the two mode MTE P7 torch from deal extreme and I took it out for a run the other night and the thing wont stay on high mode. Any sort of vibration and goes back to low mode - this happened on an unlit dual carriage way and scared the crap out of me.
I'm thinkin something is loose but i cant even work out how to get to the insides. Battery doesnt seem loose at all though and there is no rattling. I remember someone else having a similar problem but i cant find that post anymore by searching.
Thanks for any help.
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diy
Joined: 14 Sep 2009
Posts: 360
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Posted Mon Nov 9, 2009 3:04 pm |
This is relatively easy to fix.. Firstly make sure all the components are screwed up tight. Then carefully stretch the tail cap spring (don't just pull it but open it up). Then insert a small piece of copper wire (e.g. the earth on twin'n'earch) folded over as if to make a small hair grip about 3/4cm long in the pin hole between the +ive and the drop in spring.
re-assemble shake to see if fixed. Failing that a blob of solder on the 18650 each end helps. 18650s are not really designed to be used like AAs and AAAs are, they are designed to be hard wired (i.e. soldered in).
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diy
Joined: 14 Sep 2009
Posts: 360
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moggy82
Joined: 20 Feb 2005
Posts: 330
Location: United Kingdom
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Posted Mon Nov 9, 2009 5:37 pm |
| -Basic- wrote: | Can someone with some technical knowledge help me?
I got the two mode MTE P7 torch from deal extreme and I took it out for a run the other night and the thing wont stay on high mode. Any sort of vibration and goes back to low mode - this happened on an unlit dual carriage way and scared the crap out of me.
I'm thinkin something is loose but i cant even work out how to get to the insides. Battery doesnt seem loose at all though and there is no rattling. I remember someone else having a similar problem but i cant find that post anymore by searching.
Thanks for any help. |
Other problem could be the switch as its a 2 mode this is where the modes are controlled, look inside the inside of the switch and you wil see two holes unscrew this an take a look. Common sense should tell whats wrong! If its there.
Same incorrect spec sheet as on Kaidomain!
Just Measured the output of mine and its just under 300 out the front lumens, thats nearly 100 more than the 280 lumen quoted R2 at 212 otf lumens.
http://moggy82.pinkbike.com/album/lights-and-beam-pics-etc/ |
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moggy82
Joined: 20 Feb 2005
Posts: 330
Location: United Kingdom
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Posted Mon Nov 9, 2009 6:49 pm |
Check out the 3 newest pics on my PB, unable to [img] them as on mobile broadband and message box doesn't work properly.
The germans have tested tesla and magicshine and they come out both at 550 lumens. Which surprisingly is what my test also got using multiple bounce and spot lux tests.
Also shows runtime vs lumens where the MS drop a bit early on but stays brighter longer at the end! Also check out the temperature of the LED, cooler on MS as more heat is transmitted to the body!
The test also showed that the MS drawa less watts at 9.5W where tesla draws 15.2W so lumens per Watt, AKA efficieny is better on MS.
MS = Magicshine BTW.
Moggy
http://moggy82.pinkbike.com/album/lights-and-beam-pics-etc/ |
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