Yeah I get what you mean, but let me put it this way: glass itself doesn’t ‘magically’ boost light or create heat. In fact, light intensity (lux/PPFD) actually drops a bit when it passes through glass because part of the spectrum gets filtered. So you’ll never get more light inside than outside under direct sun.
The big difference is with heat. When sunlight passes through glass, it hits surfaces inside (walls, floor, furniture, soil, leaves) and gets absorbed, then re-emitted as infrared radiation. That infrared doesn’t pass back out easily, so it gets trapped – that’s the greenhouse effect. That’s why a room, a car, or a grow tent near a window can feel way hotter than the outside air even if technically less light is coming through.
So you could say: glass reduces light a bit, but it changes the way energy is stored in a closed system – less light, but more heat accumulation. That’s why growers who use natural sunlight behind a window often see slower growth compared to direct outdoor sun, but still get a big rise in temps.
It’s basically not ‘the glass increases the heat’ but rather ‘the glass traps the heat inside’. Subtle difference in wording, but makes the whole thing clearer.