Is the fuse blowing when you turn the lamp on, or while the lamp is operating? In either case, the stabilizer may be underrated for your load. If the power rating of the stabilizer is close to the lamp wattage, it may actually be underrated. The transformer will waste some power. The lamp will draw a very large inrush current when you turn it on.
Originally Posted by foto-r3
Re the humming in the head: is there anything in the head besides the fan and lamp? Take a look with the power off. Are you sure that the sound is from the head? I could easily believe the transformers humming, perhaps you are having trouble localizing the sound.
A better solution would be to switch to a 220 V lamp and fan, or at least to switch the lamp so that you don't have to use a high wattage transformer. If Omega made / makes a 220 V version of the head, you could try finding out what lamp they used.