IMO Hi Brightness Red LED 5mm (clear when unlit)
High quality, high brightness, red 5mm LED’s, shown here powered by a 3V coin cell
These are really bright especially when viewed from directly above.
I have offset the photo as the brightness from above obscured the rest of the photo!
They come in a water clear package and light up when voltage is applied.
These are a high quality component built to give reliability and long life, not to be confused with inferior parts that may be offered at a lower price.