There is evidence suggesting that exposing plants to red light increases levels of salicylic acid (SA) and induces SA signalling which is vital for plants to survive fungal infections. That's all well and good but doesn't mean you should bombard your turfgrass with red light unless you want it to etiolate. In response to too much red light, it will just make your turf stretch and bleach.
As we keep mentioning a wide LED light spectrum is best which includes red and blue (plus others). If you're concerned about increasing salicylic acid levels you can make exogenous applications using Vertmax Duo turf pigment which already contains this within its proprietary formulation. That way you increase SA levels get an instant green colouring and avoid your turf becoming like straw!