Remove Noise from DC circuit

[SurekhaIris]

I need to eliminate the noise from DC circuit.here is attached circuit.

I got the distored waveform acrose 7.5 K resistor.

Please help me to remove the noise, i have place the ceramic cap of value 100nf in parallel with 7.5 K resitor, but the still issue is remains same.

please help me out, i am very new in Power design

 

[emresel]

What is the input voltage?
May be you need to increase zener current, try to reduce resistor proportionally.

 

[SurekhaIris]

When LAMP(Load) is off it is open ckt vtg 400v, and When lamp is ON it is 100V.

Input vtg is the HID LAMP vtg.

 

[Ow@i$]

try with different value capacitors parallel to 7.5k

 

[SurekhaIris]

I have tired with many ceramic capacitor upto 200nf 50v but the still it does not correct the pure dc vtg, and when i am using ellectrolytic cap other design ckt does nt work with it as it does nt provide the ignition vtg.

is their another solution.