Recent content by Bobblehat

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    Upgrading dual head MR11 bike light with LED, doable?

    He! He! Just realised this thread is like an episode of "All our Yesterdays"! Look what Scar started with his Pond Scum lights! And then that guy "achesalot" opening up the high power aluminium square tubing LED light explosion ... I think his web page is still there somewhere ...
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    Upgrading dual head MR11 bike light with LED, doable?

    OK .... cheap is fine :) 12V 20W MR11 ... about 400 lumens each bulb when new. Will still heat up that plastic enclosure though! Using 12V 3.4Ah SLA .... Current draw per bulb 20/12 = 1.67A Run time with 12V 3.4Ah battery ..... One bulb 3.4/1.67 = 2 hours max theoretically .... probably 1...
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    Upgrading dual head MR11 bike light with LED, doable?

    Hi bobotech Before I give you some numbers to think about, I just have to agree with Steve K's 1st reply ... way too much trouble really, given that the sort of lumen output you are looking for means that the heat dissipation in plastic housings is messy to get around. Some housings may have...
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    Show us your bike light set-up

    Well this is very entertaining indeed and takes "Mad Scientist" to a new extreme! Thanks for posting and enjoy your night rides. Just one small comment ...... can you remove the key when you are cycling? It could do some damage in the event of an endo.
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    Run rear light from same dynamo as front

    Re: Run rear light off same dynamo as front Short note on above: I think 2 in series would give you a 5F 5.4V equivalent, and 2 in parallel would give you a 20F 2.7V equivalent. You'd need to take steps to make sure the caps were not getting more than their V rating in either case.
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    Magicshine 'copy' for only £27.95 (including postage)!!

    Battery and charger included or not? No sign of them on the web page, but there is mention in the description?
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    Tuning / Boost capacitor calculation - how to ?

    :thumbsup: Wot he said! I'm not entirely sure if you are trying to reduce the point at which you currently produce light without Martin's doubler circuits or with them, as you do refer to the boost circuits in your posting? Are you using the boost circuit currently, but would like to optimise...
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    recommendation for rear light

    The Pickle! Like it. That new light seems to tick all the boxes ... I know what to look at if my HHG's get stolen or smashed. Thanks for the heads-up ... love to hear more of your opinion on it. Just spotted this:- http://202.215.251.86/data/resources/safety_lights_Mar25.pdf If the diagrams...
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    recommendation for rear light

    Another vote for the Cateye TL-LD1100 especially if you going to use it a lot on the road. Not blindingly bright, but brighter than many and has a big "illuminated area" and very good brightness from all angles around to and beyond 90 degrees to the rear. Proved totally rain proof enough for...
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    PLEASE HELP ME BIKE SAFE IN THE DARK BLVDS

    I agree, lots of lumens pointing ahead, uncontrolled, can be a problem to other traffic and pedestrians. High power lights like the Magicshine and various "torches" are great in some circumstances where there is no one else to annoy, but need careful use and/or adaptation for road use. I...
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    PLEASE HELP ME BIKE SAFE IN THE DARK BLVDS

    Thumbs up to both of the above comments from Nyctophiliac. Have a look at my old set-up linked below for more details. Reflective tape, even a cheap (few £/$) helmet light works wonders to help bring traffic approaching from the side to a halt, instead of T-boning you...
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    Show us your bike light set-up

    The brightthread stuff looks similar, but I bought mine in a continuous 2 metre length x 50mm wide (needed more, bought more later!). The UK seller seems to have disappeared from EBay but I'll PM you a couple of links that look similar. At least it might give you something to search for in USA...
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    Show us your bike light set-up

    Hi Aquaflight ..... black self-adhesive reflective vinyl tape off Ebay UK (other sellers and colours are available). Came in 50mm width and is easy to cut and apply with no bubbles under the film. Still looks good after about 4 years, with no peeling at the edges/corners .... in fact it seems to...
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    dynamo triple XPG , front and back.

    I take it your red and white triples are wired in series on the star? If they are, then your red LEDs that you put in as substitute for the standard diode do not have the same forward voltage as Martin's paralleled red LEDs ...... it is at least 3 or 4 times higher .... probably 9 volts in...
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    Should I go dynamo, or stick with batteries? And if dynamo, DIY or commercial?

    Could even have been copper oxide or selenium rectifier in those days, certainly the old "plate" type. Glowbike ... I stopped at Pilom's circuit 7 too ...... 2 x xp-g/reginas and about 400 lumens OTF once I'm over 10mph, and it seems enough for commuting and cycle/canal path use. Low speed...
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