The tent has reflective sides so the average PPFD will be higher. A majority of the photons that don't initially hit the plant canopy will strike the reflective surface and move back towards the plants. As opposed to open air, where any stray photons not initially directed to the canopy may end up lost to the plants. This is somewhat less of an issue with LEDs than some other types of lighting because they are made to a specified beam angle (e.g. 120 degrees).
The IndoorFrost Pro (LM301H ) and Eco (LM301B) both utilize a Mean Well ELGC-300 driver but the Pro model does use 424 more diodes. I don't see mentioned what flux and voltage bins were used for the diodes on the two lights. Anyway more diodes driven softer will raise the efficacy level and PPF output, 2.8 µmol/J vs. 2.5 µmol/J and 780 µmol/s vs. 700 µmol/s as stated by Indoor Frost. With the higher PPF output and the same size test area (4' x 4' grow tent) will come a higher average PPFD. In this space that figure is 40 to 50 µmol/m²/s higher, depending on the hanging height of the light.
