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I suggested Luxeon LEDs when he did his first on-camera lamp using LED "torch globe" assemblies, but he didn't wanna know about it :)
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lol .. he already have messed up his existing knowledge.
hey rowan, any comments about my config? see fig. on first page. |
intresting...
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RedShow, where did you get that black round frame? I'd be very interrested by one!!
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The point that a bunch of you seem to miss is that white leds need to be CURRENT limited, not voltage limited.
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http://upload.wikimedia.org/wikipedi...200px-Ohm3.gif
Ohm looks like one cranky motherfucker. I guess he spent too much time dealing with gfy variety morons. Quote:
http://upload.wikimedia.org/wikipedi...rovementS4.jpg That's right.. you don't have a clue. Stick to PHP-CODER-FOR-HIRE-ing or whatever it is you waste your life on. Rowan seems to be the only one talking sense... and no, quoting him with thumbs up doesn't make you smart as well. I guess sheep follow the shepherd. Hope you payed attention to this one RedShoe :) http://thsrv.com/p/leds.gif |
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I'll reply to the other posts (Vick and Rowan) when I get back. |
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80 resistors? No. I mean I drilled 80 holes, put in 40 LEDs, and used 20 resistors.1 resistor per 2 LEDs Quote:
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I've told Tony we could "work something out" so we'll see. But yeah I really wann use those 5W Luxeons on the next one, but I MUST have a way to tone it down. They would wash out and blow thru anything indoors. I want to light up a pussy, not make it so bright that it blinds you. The next one will be more universal. I'm going to make fit almost any DVX. The first one only fit my specific wide angle and this one only fits a specific wide angle as well. The problem with the Luxeons is their footprint. They are like the size of a quarter. That sort of defeats the purpose of using LEDs. I use LEDs because they are so small. |
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Thanks Quantum-X. Thanks for the links. And yeah I definitly want to do it right. Once I get a decent prototype, I'm going to send to my friend that has a CnC machine and have him cut one out of Delrin and really do it up right. I'm going to have him cut in the battery ports as well. I've been toying with the idea of putting a battery pack inside and then just making it chargeable. The Drivers are definitly the next step in my evolution to becoming the next on camera lighting designer catering to the adult industry... person. What kind of camera do you shoot with? |
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I shoot w/ a 1Ds. |
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Or... Suck it up and by the Kinoflo ring light like the big boys have. The down side to that is that it's kind of big and the models kick it when you come in too close for a shot. And IT can be dimmed... oh yes, it can be dimmed. Just make sure to get the right color temp to match your other lights. Next time you are in Evs, kick one of those queens in the nuts for me. They were supposed to send me a bulb for a Rifa light and didn't. :321GFY |
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I know there is a Kino light. But how am I going to start a small side business where I can compete with them if all I do just buy it? You don't go to Ford and say, "Just go buy a Honda." Do you? I know they make computer cases as well, but I'll never buy one. I'm a builder. I build things. It's a gift... and a curse. |
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Do you really think what u just said? We don't need to limit voltage across a damn white LED? I mean, Is it OK to apply 220 volts across it? ROLF :1orglaugh :1orglaugh :1orglaugh And for the second part of your statement, we do not normally limit the current in a circuit (LED) in this case. We just apply appropriate voltage and the circuit (LED) draws current according to its internal resistance. We ONLY limit the current where we think a short circuit can happen and cause fire, like in houses and offices and we use circuit breaker for that. Its like a fuse, which limit the current up to a certain level. |
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Right, 1 resister per 2 LEDs, and those LEDs are in series? If yes, why don't you put another LED in series with 2 and eliminate the resister? Or those LEDs were in parallel? |
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And in this case, battery is 9v and we need to limit the voltage to ~3v so that LED don't get fucked. |
just so you guys know. Hooking up a 9v to a bright white LED will fry it in less than 2 seconds. It makes a pretty little "POP" sound when it dies.
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For example, attach two batteries of 1.5 volts each to make 3 volts, right? Then attach an LED to it, LED will be ON. Did we limit the current? No, current is automatically remain within limit of approx 15-20mA due to the internal resistance. Ohm's Law comes here, at constant resistance current and voltage are directly proportional. So, limiting voltage is actually limiting current as well. You are also right in one way. But again, to limit the current we actually limit voltage, assuming resistance is constant. |
boys, boys, boys... can't we just put our differences aside and do some good for the greater common of the industry?
LOL |
Vick, I'm not quite getting the "no resistor" thing. Internal resistance of what - the battery?
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I know that those keychain torch LEDs don't usually have a resistor, but that's because the button cell batteries cannot supply more current than the LEDs can tolerate. A short circuited 9V battery would probably be able to push out more than 30mA... If the forward voltage of each LED was (say) 2.8V and the battery puts out exactly 9V then the difference is 0.6V, and to stay at 30mA you'd need 22 ohms of series resistance. Surely a battery does not have such a high internal resistance? |
AC/DC. Got it.
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your calculation is somewhat right, but 22 ohms of resistance is so small that it can be ignored and we assume LEDs are working on 3v each. No doubt these values vary depending on the type of LED and strength of 9v battery. A fully charged 9v battery have potential difference of up to 9.4 volts whereas a less charged can have 8.4 to 8.8 And to answer how it works, in the chain of 3 LEDs .. other two acts as simple resistor to the third. So, actually each LED get ~3v potential difference across its terminals. I don't know if I got what you were really asking .. may be lol .. Hey, have a look at this .. it might help http://www.theledlight.com/ledcircuits.html |
And no, I was not talking about internal resistance of the battery, but internal resistance of LED itself.
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So what you have to do, is put a resistor in serie to limit the currrent. :warning |
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As I previously said you are also right one way. When two parameters are directly proportional to each other at some constant 'K' .. limiting any one will automatically limit the other. Its same as the half filled glass of water; one person says that its half filled while the other person says it half empty. Both are right. :) |
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Maybe we could do like a RedVick or VickShoe type of name. |
Vick, you're a fucktard.
A couple of things. Yes, I made an assumption. I assumed that people would be smart enough to relalise that the voltage would have to be within the correct LED tolerance. Most people got it, except you. When someone tells you to get something for dinner, do you go and buy 2 KG of Cyanide, and then in your dying moments say "well you didn't SAY you wanted something not poisonous". Quote:
I know what I'm talking about. I bet you believe in UFOs. :321GFY |
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Everyone needs to lay off of the radioshack suggestiosn. They stopped being an electronics store some time ago, you'll only find batteries and sprint cell phones there now
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