The　existing　photo-electro-thermal　theory　and　models　of　LED　are　analyzed.　Based　on　the　model　proposed　by　Hui　et　al.,　combining　mathematical　derivations,　simulations　and　experiments,　a　linear　relationship　between　the　positive　input　current　and　input　power　is　studied　when　the　LED　package　module　is　at　a　constant　temperature　of　heatsink.　From　the　circuit　control　strategy,　a　novel　photo-electro-thermal　LED　model　with　simplified　variables　is　proposed.　The　temperature　of　heatsink　and　input　current　are　the　two　variables　of　this　model,　which　are　easy　to　measure　and　control.　The　feasibility　of　the　proposed　model　is　verified　by　optical　experiments　on　two　typical　LED　package　modules.　Compared　with　the　model　proposed　by　Hui　et　al.,　the　model　is　simple　and　convenient　to　perform　circuit　drive　control.　It　is　helpful　for　the　design　of　the　LED　lighting　system　and　the　establishment　of　LED　drive　power　control　strategy　with　excellent　optical　properties,　providing　a　theoretical　basis　for　LED　dimmer　control　technology.