Hello,

I've been reading these forums for ages and have learnt a lot
And  have managed to run some interesting lamps of off substitute ballasts.

I have some eye 50w HPS lamps and cannot get a suitable ballast, how do I calculate
The required choke sizing from my lamp data? I'll be running 230v supply, 50hz.

I can fire it up with a 58w t8 ballast or a pair of parallel 28w t-8 ballasts but
They definately over or under power the lamp. One combo runs it just over 100w and the other at 44w, but the single 58w fluro ballast gets quiet hot for 44w at the lamp..

Any thoughts ou there,

Have a good one

Tim