Looking for red filter (20mm)

[electro]

Hi,

I'm looking for a red filter to put on Thrunite 1A V3 AA/14500 led flashlight.

Archer 1A V3

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I measured 20mm for the size needed.

The pictures show the light and the kind of filter wanted.

Red filter over the light helps protect seeing better in the dark at night by letting eyes stay adjusted to the dark.

Thrunite does not offer them and I haven't found the correct size available so I am still looking -

Thanks for any helpful recommendations…