Which LED is brighter, the Seoul P4 white or the Luxeon Rebel Star red?

[Onli-Won Kanomi]

That assumes 'normal' colour vision of course...a not-insignificant portion of the population has some form of what is commonly referred to as 'colour blindness' which may alter colour PERCEPTION significantly for such individuals - i.e. for me personally a bin 1 cyan LED is distinctly brighter than an equivalent powered green LED [not a great deal, but noticeably] so one needs to ask whether one is more concerned about what is "the brightest colour" to one's OWN eyes or to an 'audience' [in the case of some saberfans who may be using them in live performances for example]. If you are concerned most about what will APPEAR brightest to yourself there is an element of "Your Mileage May Vary" from the general rules mentioned above because colour PERCEPTION is a more individual therefore subjectively complex matter than ONLY the objectively measurable physics of light and an averaged 'norm' of human physiology. However despite any differences in colour vision that could influence perceived brightness between any two specific colours of light for an individual person a white light LED which encompasses most all of the visual spectrum 'should' be brighter than any single individual colour LED of the same class if voltage, current and all other factors are held equal.

[Arkanjel]

Lol, when we start discussing individual wavelength perception, this thread has gone awry....

The short of it is, SS is correct. The greens will be most visible to the eye (other than white) all other things being the same.

[RinzlerTron]

Okay, so then to answer my question, will it look better to have the white Seoul P4 with a clear red blade with poly wrap as a diffuser or the red rebel star with a clear red blade and poly wrap as a diffuser?

[Onli-Won Kanomi]

The red LED will look better with the red polycarbonate blade material imo. Any coloured polycarb blade acts as a subtractive filter so when used with a white LED removes all the spectrum from the white LED's output EXCEPT the same colour light as the blade stock thus substantially dimming the result. If you use a coloured LED that is the same colour as the coloured blade stock you will not be 'wasting' the rest of the spectrum of light therefore will not lose as much brightness - thus in your case red blade = use red LED.

[RinzlerTron]

The red LED will look better with the red polycarbonate blade material imo. Any coloured polycarb blade acts as a subtractive filter so when used with a white LED removes all the spectrum from the white LED's output EXCEPT the same colour light as the blade stock thus substantially dimming the result. If you use a coloured LED that is the same colour as the coloured blade stock you will not be 'wasting' the rest of the spectrum of light therefore will not lose as much brightness - thus in your case red blade = use red LED.

Then that's what I will do. Thank you so much!