Hiki ke wehewehe ʻia ke kukui ma nā ʻano he nui.
He photon, he ʻano nalu, he ʻāpana, he alapine uila. Hana ka mālamalama ma ke ʻano he ʻāpana kino a he nalu hoʻi.
ʻO ka mea a mākou e manaʻo ai he mālamalama he ʻāpana liʻiliʻi ia o ka spectrum electromagnetic i ʻike ʻia ʻo ke kukui ʻike maka o ke kanaka, kahi e ʻike ai nā cell i loko o nā maka o ke kanaka. ʻO ka hapa nui o nā maka o nā holoholona he ʻike i kahi pae like.
Hiki i nā pepeke, nā manu, a me nā pōpoki a me nā ʻīlio ke ʻike i kekahi kekelē o ke kukui UV, aʻo kekahi mau holoholona ʻē aʻe ke ʻike i ka infrared; iʻa, nā nahesa, a me nā makika!
Hoʻololi ka lolo mammalian i ke kukui i 'kala'. ʻO ka nalu a i ʻole ke alapine (frequency) o ke kukui ka mea e hoʻoholo ai i ko kākou kala i ʻike ʻia. ʻO ka nalu lōʻihi e like me ka ʻulaʻula ʻoiai ʻo ka nalu pōkole e like me ka uliuli.
No laila, ʻaʻole pili ke kala i ke ao holoʻokoʻa, akā he hana na ko kākou manaʻo. He hapa liʻiliʻi wale nō ia o ka spectrum electromagnetic piha. He photon wale nō ma kahi alapine (frequency) i koho ʻia.
ʻO ke ʻano maʻamau o ke kukui he kahawai o nā photons, e hoʻoluliluli ana ma kahi nalu kikoʻī.