Photon torpedoes are often depicted as being easy to modify to suit specific situations. Despite the stated maximum yield, photon armaments can apparently be made far more destructive with relatively little effort.
Theoretically we could modify a normal photon torpedo with a gravimetric charge to increase its destructive yield to 54 isotons.
Some will say that 50-80 isotons would be sufficient to destroy a small planet, but until we have done so, it is only speculation.
However I find that our immediate interests should involve DIY hobbyists. Scaling down to a personal photon emitter should be sufficiently achievable by most Arduino enthusiasts.