You likely either don’t have “use emissive for static lighting” checked on the strip light static mesh or don’t have emission set very high (multiply the value going into “Emissive” in the material to bump it up a bit).
Additionally, the reflection of the strip light you’re seeing on the floor disappears when you’re stood up because it’s in screen space: if you can’t see the object being reflected, it won’t produce a reflection. You could probably mitigate this by putting a reflection capture actor down between the strip light and the floor so you get a pre-rendered reflection when it’s out of sight.