Stupid LED lights! Help!

DDStime

So I make these glow cubes as a side biz and use LED for the lighting. They use batteries, but I'm trying to go to a plug in LED. Anyone have any good suggestions that are bright and fit in the glowing cubes I make?

Here is what they look like:

www.etsy.com/shop/glowcave

NetworkNewb

Something like this?

https://www.amazon.com/dp/B00ZFTDWVU/ref=psdc_14328071_t3_B016MDPWL0

Would have to make something that holds it in place inside the box of course...