hey man yes a light with a blue spec is the perfect light for your veg plants and the red spec is for the flowering stage
you can place lets say you buy 10 of the cool blue led 12 watt then you can add 1 or 2 red spec just for a bit of that i dont know if it will help when its only veg but a light with a blue spec if for your veg plants and the red is for flowering this is how i understand it