I guess I will try to talk you out of it...

Early Solid State classics like Embryon are called classics for a reason. These Bally/Stern/Williams titles are the pinnacle of pinball IMO. Unique themes, gorgeous artwork, inventive layouts, killer sounds, electronic speech, etc. Perfect overall design from the coolest era in pinball.

I'm all for adding LED lighting & getting creative with some of the matrix products out there to improve the playfield. But when people start modding these titles....painting the legs & coindoor, adding stange toppers, LED leg lights, & god knows what else.... it just looks wrong. And if you ever go to sell it, the buyer will likely not be thrilled about the changes you've made either.

It's not a modern game. Classics should remain classic looking. But that's just my opinion.

https://pinside.com/pinball/forum/topic/embryon-owners-club-fans-also-welcome/page/11#post-5680762

This is what I did to mine, and to be honest, I still feel guilty about adding that spinner spotlight. I couldn't imagine adding under-cab & exterior LED lighting.

It is your game though, so you can do whatever you like. Hope it works out for you!

As far as aesthetics goes, I figure, it's your game, do what you like.

Some people will adhere to purist ideals and say you shouldn't change anything. But that's an aesthetic choice in and of itself. Many people have this tendency to want to personalize objects they own, or even add adornments to their own bodies. Motor vehicles, computers, houses, even mobile phones, get this kind of treatment, and there are probably dozens if not hundreds of common examples elsewhere in consumer goods. Why not pinball machines?

Personally, I keep my machines as close to original as I can. I'm even loathe to replace incandescent lamps with LEDs in spite of the benefits of maintenance and visibility. But then, I also think jacked-up pickup trucks and lowered Honda Civics look pretty stupid too. Obviously there are lots of people who disagree with me, and I think that's fine. As long as they don't want to modify my truck or car or pin or whatever, more power to them.

The one exception to this would depend on how you view your ownership of the machine. Some people treat pinball machine collection as an act of historical stewardship. If you feel that way about the hobby, then you probably should be keeping your machines in original condition. But otherwise, whatever you like seems perfectly fine to me. And even in the case of stewardship, as long as the machine is easily restored to its original condition, then as long as the temporary change makes you happy, go for it.

All that said, I doubt you need a power supply that large for some basic LED lighting, and I'm a bit wary of any non-UL/ETL-certified product, especially sold on Amazon, and especially from China. Way too many stories of cheap Chinese Amazon-sold electronics bursting into flames, usually involving lithium ion batteries, but sometimes just bad wiring.

I would look for a smaller sealed power adapter that has just the voltage you need, and is rated closer to what you need (add up all your LEDs watts, divide by 80%, and make sure your power supply is at least that big), and make sure it's certified by UL, ETL, or both.

That's exactly the power supply I have used in several games I have modded and added LED strip lighting, etc. Good choice.

Running a 12V supply in a Star Trek cab for stadium lighting. It's plugged into the service outlet with a switch socket, haven't put it on the switched power.

Yeah xpin 7-digit were installed when I purchased

Embryon can be rolled multiple times in a single game, especially if you have the home ROM installed with 2x scoring during multiball. It requires a 7-digit modification for sure.

I'm not a fan of the xpin displays. They are out of sync with the sounds when counting the bonus at the end of ball. Mine are also flaky at times. That's probably what you're seeing in that video. As I said they came with the game when I purchased, but there are other alternatives now.

If you have an NVRAM Weebly MPU, he has built-in code that allows for 7-digit conversion on many Bally early solid state games. Just requires the installation of any type of 7-digit displays, some additional wiring run & the flip of a dipswitch. That's the route I go.