Loud flashes on a sunny day
On clear, sunny days, light penetrates deeper into the water, creating intense reflections, particularly in shallow areas or over sandy bottoms.

Glitter lures capture and reflect this light in powerful flashes. This phenomenon makes the lure even more visible and attracts the attention of predatory fish.

An asset for sight-hunting fish
Not all fish hunt the same way. For species that hunt by sight, such as tuna or sea bass, the use of glitter lures on sunny days is a major advantage.
This is also true when competition is intense, especially in hunting areas. This makes it easier to stand out from the crowd, which in turn makes it easier to attract predatory fish.

The glitter helps to attract active fish. I haven't noticed any real added value compared with posted fish.
How to animate glitter lures?
During my fishing trips, I've found that on sunny days, fast, erratic animations with a glitter lure produce the best results. These animations give the lure an unpredictable swimming action, especially when combined with a dedicated head like the Fiiish Dart. As a result, the light flashes are more intense and attract more attention from predatory fish.
The above explanations apply to most glitter lures. My personal selection is the Crazy Paddle Tail 150 by Fiiish in the following colors Ghost Minnow and the Black Minnow "Barracuda Tour" edition.

These two lures are best animated in the water layer, rather than on the bottom, in areas 10 to 15 metres deep.
The latest addition to the Fiiish range, the Crazy Sand Eel 150 and 180 in Kaki Strike and Blue Strike are both perfect for fishing in sunny conditions.
Jigs, especially casting patterns that move quickly through the water, are formidable in these conditions. Even if they are not transparent, shiny models stand out in this type of situation.
Watch out for excess!
Glitter can greatly enhance the attractiveness of a lure, creating flashes of light that attract fish from afar.
Be careful, too much glitter can be harmful. The inciting signals provided by the flashes of glitter can frighten fish away, counteracting the desired effect.

Don't hesitate to change the color of the lure according to the light and color of the water. If the water is tinted, I'd go for a lure in green or khaki tones with glitter. On the other hand, if the water is clear and the weather very bright, I'd go for a sky-blue or white model.