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Type: Posts; User: Phil Rhodes

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  1. Replies
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    That's not something you can easily do off the...

    That's not something you can easily do off the shelf, at least not in the way you probably want. You can sort of do it by modifying a couple of off-the-shelf DC-DC converters with one of those...
  2. I'm looking into it; it can probably be done for...

    I'm looking into it; it can probably be done for not much money, but I fear if we want full colour mixing and calibrated whites then the cost of parts and labour may make it not worthwhile.

    Do we...
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    Those power banks can be very handy and extremely...

    Those power banks can be very handy and extremely well-priced; I wish someone would do something a bit more affordable for that part of the film and TV industry that isn't making nine-figure...
  4. Segmented motion blur is one way you can most...

    Segmented motion blur is one way you can most easily see things like this, yes. As I say, at conventional shutter speeds and frame rates it's likely to be less visible. The maximum relative exposure...
  5. Yes, sure, and I think that's fine, so long as...

    Yes, sure, and I think that's fine, so long as it's understood by everyone.

    One upside to all this is that it's pretty easy to get DC converters which will do it without flicker, so frankly there...
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    One thing that may be worth mentioning. Nickel...

    One thing that may be worth mentioning.

    Nickel metal hydride batteries have somewhat poorer power-to-bulk ratio (depending how you measure it) than lithium-ion, but not to the extent that they're...
  7. Noah, if you have a rolling-shutter camera, if...

    Noah, if you have a rolling-shutter camera, if the light comes on or goes off during the readout period (which LEDs are more than fast enough to do) then you get a torn frame. If you make your PWM go...
  8. The higher the frequency, sure, the more likely...

    The higher the frequency, sure, the more likely it will be to work most of the time. I worry that a specific camera-light combination could easily cause problems that are difficult to predict and...
  9. I'm a little cautious about some of the...

    I'm a little cautious about some of the techniques being discussed here.

    The sticky strip approach works to a degree, but there's a couple of quite big downsides associated with the resistive...
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    From this I would assume you're after a 28-watt...

    From this I would assume you're after a 28-watt T5 fluorescent tube with good colour rendering.

    You might want to try something like the Philips Master series (linky) which are advertised as...
  11. We call those a howie batten. And ours are...

    We call those a howie batten.

    And ours are better, because they have 20 MR16s instead of 10!

    And they've been known to get hot enough to drip molten solder onto the cast!

    They are a menace.
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    Yes, I've seen those. Difficult to mount in a G12...

    Yes, I've seen those. Difficult to mount in a G12 base intended for a more conventional 150W type, but my principal concern was simply UV emission. Does the data sheet have anything to say on the...
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    What I don't get is why it's considered...

    What I don't get is why it's considered particularly useful for an LED panel to be flexible. I've used them. I didn't find much reason to bend them. It makes them fractionally bulkier than an...
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    G22, but yes. The ignitor is almost certainly...

    G22, but yes.

    The ignitor is almost certainly in the back of the lamp head. It'd be very unusual for them to be very far away on a hot-start device. I'd rehouse the ballasts entirely and therefore...
  15. I think possibly that the size issue comes down...

    I think possibly that the size issue comes down to one of sheer power. Much as people like to talk up LEDs, they're mainly not all that powerful - the most commonly owned stuff is rarely much above...
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    Given the relaxed requirements on colour quality...

    Given the relaxed requirements on colour quality this ought to be reasonably easy to DIY, although watch out: most RGB(W) LED strip is common anode, which is not really usable with commonly-available...
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    There's still some hot-start chroma-qs in Canada....

    There's still some hot-start chroma-qs in Canada. If the shipping and duty weren't so miserable, I'd be an owner. I'd like to know how much noise they make. If they're very quiet, it might still be...
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    I was thinking of the same thing. They called it...

    I was thinking of the same thing. They called it softscreen.

    It was essentially a large sheet of transparent plastic (polycarbonate, probably) with a lightly frosted finish. You could probably...
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    If you're after really saturated colours, LEDs...

    If you're after really saturated colours, LEDs are your friend.

    If you don't want good white light quality, they're cheap and easy.
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    UV filter gels are probably not an adequate...

    UV filter gels are probably not an adequate safety filter - they're designed to keep UV skylight off paintings in art galleries, not to perform critical safety filtration.
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    I did something rather like this using the...

    I did something rather like this using the knock-off iMax chargers that you can get from china. I use them to charge some custom (eh, homemade) NiMH packs that I use for small lights. It ends up...
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    That would require nearly seven times efficiency...

    That would require nearly seven times efficiency improvement between tungsten and LED, which is not plausible, assuming the same style of housing. Other types of housing may differ, but then you...
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    Definitely sounds like a bad fan. I'd replace it...

    Definitely sounds like a bad fan. I'd replace it as a matter of priority - if it fails altogether, as it inevitably has to at some point, it could destroy the ballast.
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    I have not used one of these things for years,...

    I have not used one of these things for years, but it strikes me that "LPF" might mean lamp frequency, and therefore adjusting it might possibly help quiet any buzz. Complete speculation, could be...
  25. I looked at this stuff. The only issue I can see...

    I looked at this stuff. The only issue I can see is that "real" carbon fibre mattebox rods tend to have a matte ground finish, whereas these are gloss. I'm not sure if that means that nick and dings...
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