I think the 8 hours full sun works in the mountain regions in the tropics, where there is sunshine, lots of cool air, enough humidity. That is why in my homeland the vegetable center is in the cool highlands. The lowlands carry the rice paddies. But then again, it is the tropics, often raining, warm temperatures sustained, island nation surrounded by water, so there will always be high humidity levels.
Unlike here in the US with its 4 seasons and its corresponding varying micro climates within a zone, so got to take those hardiness zones as a good suggestion, but observe your planting area closely and adjust as needed.