I am in Montreal and Ludwigia super red doesn't exist here I have grown Ludiwigia Repens its nowhere close to that pinky red. Those super glowing red shots you see are usually someone who is shining purple/red light on their tank or who pumped up the saturation in photoshop not a realistic look to shoot for. I have gotten a nice saturated dark red but nothing like the picture above.
ABC plants in Montreal sells Ludwigia sp. super red (Palustris 'super red') as a tissue culture if your looking for some. It is a deep red even under daylight bulbs.