I found one mosfet P30NF10
datasheet: http://www.st.com/stonline/products/...re/ds/7817.pdf

The setup worked upto some extent but with few concerns.
firstly when system was fired up, the lamp started glowing but very DIM. I increased the resistance with 1.5K more with 4.7K and this problem got sorted. Now the lamp stays OFF when system is powered up

The problem is that the lamp is not glowing to its full potential. Any ideas please as what changes I can try in the hardware to make this work, i.e. make the lamp off at value 0 & glow at full potential at 255.
I am using 20KHz as frequency with HPWM command.
Thanks