Does any one have Lamp specs for 20 watt CMH « on: November 02, 2020, 11:32:16 AM » Author: funkybulb
I like to know lamp arc voltage and current for 20 watt philip CMH?
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No LED gadgets, spins too slowly.  Gotta  love preheat and MV. let the lights keep my meter spinning.

	Re: Does any one have Lamp specs for 20 watt CMH « Reply #1 on: November 02, 2020, 11:55:33 AM » Author: Rommie
I don't know if this will help, but the only 20W CMH lamp I can find on Lamptech is this GE one.
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Ria (aka Rommie) in Aberdeen
Administrator, UK and European time zones. Any questions or problems, please feel free to get in touch

"There is no shame in not knowing; the shame lies in not finding out." (Russian proverb)

	Re: Does any one have Lamp specs for 20 watt CMH « Reply #2 on: November 02, 2020, 12:19:01 PM » Author: funkybulb
Thank U MissRia  That means I am going have to rewind a fluorescent ballast  With half thickeness of wire what on there that drives 40 watt   Lamps and go from there.   As there not a 20 watt MH magnetic ballast in the USA to run them.
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No LED gadgets, spins too slowly.  Gotta  love preheat and MV. let the lights keep my meter spinning.

	Re: Does any one have Lamp specs for 20 watt CMH « Reply #3 on: November 02, 2020, 12:22:09 PM » Author: Rommie
Hmmm, best of luck, ballast rewinding is not for the faint hearted  James might know more about this, worth asking anyway.
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Ria (aka Rommie) in Aberdeen
Administrator, UK and European time zones. Any questions or problems, please feel free to get in touch

"There is no shame in not knowing; the shame lies in not finding out." (Russian proverb)

	Re: Does any one have Lamp specs for 20 watt CMH « Reply #4 on: November 03, 2020, 04:06:17 PM » Author: Medved
Quote from: sox35 on November 02, 2020, 12:22:09 PM Hmmm, best of luck, ballast rewinding is not for the faint hearted  James might know more about this, worth asking anyway. 20W CMH needs active arctube temperature stabilization (specific response of the ballast based on the arc voltage changes, include dynamic response, so  time constants), so magnetic ballasts are out of the question (they would lead to extremely short lifetime till temperature instability would make it either cycle or shift color or even crack for overload).
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No more selfballasted c***