What will be the best strong small LED could be for this application?

Using Arduino General Electronics
1

I want to make decorative lamp like this and I want to put two or one 5V led modules which will fit inside. What options I could use?

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Length of the transparent plastic will be 500mm in total and width 10mm. I want that all the light will be well spread through all transparent material and the lamp module or modules will be only in center. And I hope it look like this, for example:

White LED Backlight Module - Small 12mm x 40mm : ID 1626 : Adafruit Industries, Unique & fun DIY electronics and kits
https://www.aliexpress.com/item/1005006057504958.html

For now there is the hole 6mmx6mm through all the material but I don't know it is better to fill it fully and the light will spread better or keep the cut and maybe the results will be equally good? I can alternate plexi glass wall now I designed them as 2mm but I can reduce them to 1 mm or fill tem fully. In the examples of DIY car interior lighting strips they are using plastic pipes or fully filled strips with plastic?

2

I would just google it

3

If it were me I would use 12V. Why? Look at this chart:

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Remember LEDs are current devices not voltage devices.

4

The design of light spreaders like this is complex, because you want the light at the end to be the same intensity as at the center; also you want the light to be aimed at the subect, not the viewer.

Your drawing doesnt show how the leds will be coupled into the spreader - the light will need to be aimed along it, not down.
Id suggest you use something like this
https://shorturl.at/G5Y5X