led to hps during flower

i usually grow under a 600 hps in a 4x4 area but had to downsize and went with a galaxy hydro led lamp to cover approx 3x3 area ..... well im 4 plus weeks into flower and the bud sites are tiny , i would like to switch back to hps for the final 3-4 weeks so they will pack some weight on. what is the best way to do this or am i just screwed for this run

anyone ?

Sure why not? Crank up the hps...giddy up...

If it were me, I would run both... I don't know how big the LED is, how many plants etc.,,, but if it was my tent, I would drop that 600 in and use the LED to supplement.