I te whakaaro ki te whiriwhiri i tetahi taputapu rōrahi kōwhai, whakaarohia te whakatau i ō whāinga e pā ana ki te hauora me ō pānga ki te āhua noho. He rerekē ngā taputapu e wātea ana i te mākete, kāore e taea te whakamahi i ngā āhuatanga motuhake, hei tauira, te whakangāwari i te mamae, te whakapai ake i te kiri. Me whakarite kei te tuku te taputapu i te pāmahana pai i waenga i te 600-900 nm, nāna i te rārangi pai mō te whakauru ki te kiri. I tua atu, tirohia mēnā he maha ngā tautuhinga kaha o te taputapu, he rahi e tika ana mō te nekehanga me te auau whakatikatika i te whare, he whakaritenga uaua mō tetahi taputapu rongoā.