Hi James,

If the output is four times higher it will appear brighter even if it is
a little yellow.

What package are the LEDs? Viewing angle and focus have a huge impact on
the apparent brightness, so if you can use a prefocused LED that will
boost your brightness.

Cheerful regards, Bob

On Mon, Sep 30, 2013, at 08:26 AM, James Holland wrote:
> I'm looking to select some green LEDs for a clock that will be used
> outdoors. Looking at the catalogues I can get various wavelengths and the
> highest light output appears to be from those with a more yellow output,
> around four times that of a pure green LED. The clock has a green filter
> which I would guess is closer to a pure green. Am I likely to be better
> off with a lower power pure green LED or a higher power yellow/green LED.
> Unfortunately I don't have any real data, the display was removed from a
> clock so the existing LEDs are an unknown quantity as is the filtering
> capability of the filter so I'm really just hoping for general
> information based on other's experiences.

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