+1.
Before going out and purchasing something, give this a try on the Trijicons that your Glocks already have. Get a black Sharpie and a red Sharpie. Black out the white outline of the rear tritium vials. Then use the red Sharpie on the lenses of the rear vials. The front sight should stand out better in the light, and in the dark, the rear dots will be a dull yellow, letting the green front be much more prominent.* If you wish, then paint the face of the front sight with whatever color strikes your fancy, being careful not to get any on the lens or white ring of the tritium insert.
* All credit to Mr. Haggard.