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I require an RGB white + amber LED SMD chip. Unfortunately, it looks like nobody really makes such a thing except for one seller on Aliexpress. I tried purchasing a few of these only to find their definition of amber is more of a burgundy/red/orange hue.

So instead I'm considering a 5050 5in1 RGBW CCT chip and somehow modifying the warm white chip to produce a more true amber/golden yellow colour.

Is there a suitable film that I can stick over the warm light side of the chip to convert it into more of an amber light?

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The purpose of these LEDs is to illuminate a light guide that's only big enough to accept one chip, two is not possible otherwise a separate amber chip would have been my solution.

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  • \$\begingroup\$ Kapton tape might do... \$\endgroup\$
    – user16324
    Commented Feb 21, 2021 at 22:11
  • \$\begingroup\$ have you considered separate leds and light pipes to channel the light into the light guide? \$\endgroup\$
    – jsotola
    Commented Feb 21, 2021 at 23:16
  • \$\begingroup\$ I can get RGBY/W LEDs but has a large MOQ \$\endgroup\$
    – D.A.S.
    Commented Feb 21, 2021 at 23:57
  • \$\begingroup\$ The idea of separate light pipes was exhausted in the end, it's such as tight spot and I'm only left with a diameter of 5mm on each pipe to play with unfortunately \$\endgroup\$
    – Mark Layworth
    Commented Feb 22, 2021 at 1:33
  • \$\begingroup\$ @TonyStewartSunnyskyguyEE75 would it be possible to share a link to the RGBYW chips? I'm not sure if it'll be a close enough colour temperature to amber, but it's worth a shot at checking out \$\endgroup\$
    – Mark Layworth
    Commented Feb 22, 2021 at 1:34

1 Answer 1

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Unless you investigate fluorescence, you can't get any colour out of a filter if it isn't already in the source. If the colour is off that much then you're going to need a lot of filtering to remove the deep red portion of the band that you've got and you won't be left with much light.

It's not clear from your question whether you need three different LEDs or one colour at a time. If the latter then your colour could be obtained by blending the RGB.

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  • \$\begingroup\$ Yes that was one of my main worries, loosing brightness from the output would be a major blow for the project. RGB would be required when colour is introduced, however the main use would be white and amber - previous attempts with an RGB chip failed as the light guides gave off a blue/purple hue, so instead a dedicated white chip was required. \$\endgroup\$
    – Mark Layworth
    Commented Feb 21, 2021 at 20:47
  • \$\begingroup\$ Was the blue/purple because the blue LED chip was centred on the light guide and was therefore stronger? \$\endgroup\$
    – Transistor
    Commented Feb 21, 2021 at 20:49
  • \$\begingroup\$ maybe try darkening the blue part of the LED, perhaps use a series resistor or a magic marker. \$\endgroup\$
    – Jasen Слава Україні
    Commented Feb 22, 2021 at 3:33

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