Side Lighting and 18/6 cycle in last week of flower

One doesn’t hear much about this ; have used side lighting (12by12 full spectrum Led panels) But know use 12by12 “blue” spectrum (only) panels for veg and “red” 121by12’s for flower. Side lighting can increase yields ! what is best 12by12’s or bars ? maybe bars due to light  spread/intensity. I do see were Infinity Tents offers side lighting.    RECENTLY Have  read about this: use 18/6  cycle last week of flower  to increase bud size, ect. But  should one use “veg” spectrum or just bump=up the hrs on flower spectrum ? for get the reasoning of this cycle, maybe stress. At any rate going to try this next grow.   If one uses  “dark times” before harvest would still use.   Comments welcome and valued !!!!!!!  another reason to use  side lighting is that it can help decrease flower stretch But increases lateral branching and bud sites.