Recent content by Lithopsian

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  1. L

    G4 leds

    You can use them without trying to dim them and there shouldn't be any problems. Dimmers do vary, but if they light up fine then they should be fine. Dimming non-dimmable LED lamps is a bit of a gamble. They can do all sorts of strange things, including actually dimming. It is hard to say what...
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    Question Regarding Luminance.

    I'm not seeing a picture, so I'm not sure what your #1 and #2 are. I think it would be good to stop thinking about point sources completely. That is just a simple case for drawing a picture showing angles in the classic "cone". Luminance is not defined for that case (or rather it is, but it is a...
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    Brightest White LED Strips (Warm white + cool white)

    Ah, I see. You want both white SMDs on the same strip. You can't trust the specs given on Ali and I can't see what the current is for the one pictured.The price is crazy enough to be a legitimate high power strip but that's no guarantee.
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    Brightest White LED Strips (Warm white + cool white)

    5630s can and should be brighter than 5050s, but it isn't necessarily the case. Many of the cheaper strips have massively de-rated 5630s which may as well be an old 3528 for all the light they produce. You can't trust their light output specs, not even the rated power. If you can get a decent...
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    Question Regarding Luminance.

    There are an infinite number of "cones", each with an infinitely small luminous intensity. You will either have to instinctively feel or just accept calculus for this approach to make sense. Most explanations focus on only one cone to make it more intelligible. Overlapping should be ignored - we...
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    Are 3030 SMD LED's really this bright?

    That page has bugged me before. The information is useless and since it is completely unreferenced, I have just removed it
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    LED strip lighting advice for accent basement lighting

    You want RGB and white? It is possible, but just checking. RGB almost inevitably means 5050 strip since they have three diodes per SMD. 5050 is old technology, it would be pretty much obslete if it wasn't the mainstay of the RGB market. 3528 is obsolete, no reason to buy it except price, and it...
  8. L

    LED Strip question - Not quite Flashlight related, but kinda is?

    No real difference in design or cost. Slightly different shade of yellow phosphor. This method can produce any arbitrary colour temperature that is needed (within reason), but in practice the manufacturing tolerances mean there is a spread of a few hundred K in the colours within the same batch...
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    Can use SMD strips with 350mA driver

    Quite a few things here, some of which may already be obvious to you. Answering your basic questions might come last. The R4-5A is not so much a driver as a controller. It takes an existing low voltage supply and conveniently provides four outputs which can be used for RGBW strips and...
  10. L

    Best LED grow lights

    Don't believe everything you read on websites trying to sell you weird purple LEDs ;)
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    Can use SMD strips with 350mA driver

    SMD strips are ''explicitly'' constant voltage devices. They actually consist of multiple parallel circuits of 3 SMDs, each including a current-limiting device (usually just a resister, but occasionally a transistor). That's why you can cut the strip to any length you want. The current drawn by...
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    Can use SMD strips with 350mA driver

    Are you asking if this is possible? Yes, just barely, in some very specific circumstances. Are you asking if this is practical? No, it isn't, unless your strips have exactly the right length, are not RGB, and you have a high tolerance for risk. Let's keep it short. This is the wrong driver and...
  13. L

    How to connect LED strip to batteries?

    No way anyone can tell you how long without knowing what the LEDs are. Or what the battery is for that matter. Probably less than a day, maybe an awful lot less. Since LEDs are so sensitive to voltage changes (tiny voltage change, huge brightness change), they nearly always require some sort...
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    *PROJECT* Need advice on long distance LED rgb light strip project

    LED strips are almost always used for indirect lighting. One obvious exception is for under-cabinet task lighting. Either way, it is not desirable to have the individual LEDs visible except for specific special effects. Note that indirect lighting means you will have to use quite a lot more...
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    Recent LED Strip Comparisons?

    So do you think the quoted specs are about right for what you have? 63 lumens/m is barely a nightlight. I suppose you can use several strips in parallel :)
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