Narva,Hazard Systems, Whelen, Tomar and a few other companies make proper strobes that sit inside head/tail ights without effecting the other globes. The riceboys also have "pace car" lights. I think HOT 4s magazine has ads for them. Interestingly they are legal IF they are white or amber and don't block other lights.
Nothing on this earth beats holding your newborn child for the first time.