To　realize　the　continuous　adjustment　of　the　light　quality　ratio　of　LED　plant　lighting　power　supply,　a　plant　lighting　driver　control　strategy　based　on　the　spectral　characteristics　is　studied　in　this　paper.　First　of　all,　the　spectral　mathematical　model　of　monochromatic　LED　chip　is　established.　Secondly,　the　mathematical　model　of　the　number　of　photons　generated　by　LED　the　driving　current　is　further　studied　and　then,　a　new　driver　control　strategy　about　the　pant　lighting　is　proposed　based　on　the　model　of　the　number　of　LED　photons.　At　last,　a　step-down　circuit　built　by　RT8471　chip　is　used　as　the　LED　driver　power　supply　to　verify　the　correctness　of　the　new　driver　control　strategy　in　this　paper.　Different　color　LED　chips　of　Cree　and　Philips　Lumileds　companies　are　used　as　the　circuit　loads.　It　shows　that　the　errors　values　between　the　results　from　the　experiments　and　the　theoretical　model　calculations　of　the　number　of　LED　photons　are　all　less　than　5%.　So,　the　new　plant　lighting　driver　control　strategy　proposed　in　this　paper　is　feasibility　and　has　certain　theoretical　guiding　significance　and　engineering　value.　©　2020　Published　under　licence　by　IOP　Publishing　Ltd.