I have not heard of this with clown hets or any other recessive morphs for that matter, that certainly doesn't mean it's not true though. But, I do have quite a few clown hets and they are all beautiful but I would not say they are any brighter than the same combo without the clown het gene, at least not that I can tell. I'm pretty sure that most recessive morphs can not be visually confirmed in the het form. Although I have heard that some het pieds have 'markers' but I am not familiar with what it means but have heard if from enough reputable sources for me to believe it's true, I just don't have any experience with the pied morph.