That is kinda right, with LP comparable to Candela en LU being a focused beam, however LP and LU are still the same, being both light.
Collecting light using photovoltaic cells and transporting that to a single block is more magic than realistic and honestly does not make sense at al.
The most realistic thing that could work with this LP system are fosforescent materials.
[Phosphorescent - Phosphorescence - Wikipedia] Phosphorescence - Wikipedia