Red almost never spooks them; green does on occasion, but they don't seem to be in a hurry to vacate the area and still allow time for a shot. For me, dark hogs are harder to see in a red beam than a green, but everyone's vision is different. If you slowly lower the light onto them rather than blasting it on directly at them, they are less likely to spook -- even when a pure white light is being used.
Have found this advice to be spot on...I like the green light, mainly because its what Ive used most, but did kill a hog the other night with white light. Kudos on the slowly lowering the green light on them.
As for 50 mm scopes....No.More marketing than anything else thats practical.
