Hps light and ballast noise and heat hazard

[olioli1999]

150w Hps light and ballast are completely silent until they fully light up (5 minutes). Once my light is fully lit up it start squeeking/buzzing a high pitch noise like crazy. The light gets so hot in the first 5 minutes it burns my hand .. Is this normal?

Btw my ballast doesnt have a switch it just turns on when i plug it in (chinese shit) i feel like its running too much electric into the light but maybe im wrong, i just got this hps from cfls

 

[midgetaus]

150w Hps light and ballast are completely silent until they fully light up (5 minutes). Once my light is fully lit up it start squeeking/buzzing a high pitch noise like crazy. The light gets so hot in the first 5 minutes it burns my hand .. Is this normal?

Btw my ballast doesnt have a switch it just turns on when i plug it in (chinese shit) i feel like its running too much electric into the light but maybe im wrong, i just got this hps from cfls

buy cheap buy twice

Most things chinese arent made to a standard... therein lies your problem

 

[dbkick]

make sure the lamp is good and seated.
Cheap lamp/ballast combos will ring, it's from either a ballast with a high thd output and/or a cheaply made lamp.
Acoustic resonance is the term used to describe the noise.
If it's an old core and coil ballast (magnetic) , those are known for low thd.
If it's a cheap digital ballast those can also be known for higher percentage of thd.
This will cause acoustic resonance and the lamp will vibrate to a point it puts out a ringing noise.
Personally I am hearing impaired enough I can't hear up to that frequency but it must be annoying as fuck to someone with normal hearing.