The spelling of "sec the light" is determined by its distinct phonetic sounds. In IPA phonetic transcription, "sec" is pronounced as "sɛk" with the "e" sound being more open than "e" in "bed". "The" is pronounced as "ði" with the voiced "th" sound as in "then". Finally, "light" is pronounced as "laɪt" with a long "i" sound as in "eye". Altogether, "sec the light" is a phrase often used in photography to instruct someone to adjust the camera's exposure time to capture more light.