"It is, in theory, around three times as efficient as the DAB that we're used to"
Does that mean it's 3 times worse or 3 times less worse? I bought a portable DAB radio some years back. I gave up on it because unlike a portable radio that i can listen to on the move, i cold only listen to DAB if i sat still and didn't move, otherwise the signal kept dropping out. Bit pointless when it was designed to fit in your pocket for portable listening!
As for Hugo, I have had a portable light taht take batteries for years, It's called a torch, and I have a bigger one that uases LED's too, it's called a battery powered lantern. Neither cost £69.99 !!