When in the dark, Glow Item Frames appear as normal like they are supposed to, lighting up the frame and the item inside. However in the light, Glow Item Frame do nothing to the luminosity of the item inside and the item frame appears considerably darker than a normal item frame, proved by how the outline of the normal item frame has the correct color in light, while a glow item frame has a much darker frame. This makes glow item frames ugly and very unhelpful, as in most places where Glow Item Frames would be used, it would normally be lit to prevent mob spawns. Please fix this issue very soon.

Compare the two glow item frames in the attachments, and you will notice the considerable difference in the lit glow item frame versus the dark glow item frame.