How does one understand the elements of the Pure Octad in Sunlight?

According to Abhidhamma, the smallest unit of Rupa is called the Suddhashtaka(Pure Octad) which has the following 8 elements: patavi, apo, tejo, vayo, vanna, gandha, rasa, and oja Regarding Sunlight, the tejo(heat) and the vanna(color) elements seem obvious, but how does one understand others? From a Vipassana point of view, is this problem occurring because the mind is getting stuck at the concept of Sunlight?