Run-up time of American 1000-1500W probe-start MH lamps: Question « on: August 31, 2025, 10:52:54 AM » Author: dor123
I've noticed that the American 1000-1500W probe-start MH lamps takes as long as LPS and medium pressure mercury lamps to run-up to full output. @Ne-guy M.CZ said me that his GE Multivapor 1000W probe-start MH lamp takes as long as 10 mins to reach full output. On the other hands, European >1000W MH lamps, includes ones with starting electrodes like the Osram HQI-T 2000W/D/I and 2000W/N/I, takes much shorter time to run up to full output. What is the reason for this?
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	Re: Run-up time of American 1000-1500W probe-start MH lamps: Question « Reply #1 on: August 31, 2025, 07:11:40 PM » Author: WorldwideHIDCollectorUSA
I think the reason for this is because most North American 1000W M47 probe start metal halide lamps and 1500W M48 probe start metal halide lamps are usually operated on CWA ballasts while European HID lamps are almost always used on reactor ballasts. I say this because I have observed that lamps operated on HX and reactor ballasts tend to warm up faster than lamps operated on CWA ballasts.
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Desire to collect various light bulbs (especially HID), control gear, and fixtures from around the world.

DISCLAIMER: THE EXPERIMENTS THAT I CONDUCT INVOLVING UNUSUAL LAMP/BALLAST COMBINATIONS SHOULD NOT BE ATTEMPTED UNLESS YOU HAVE THE PROPER KNOWLEDGE. I AM NOT RESPONSIBLE FOR ANY INJURIES.

	Re: Run-up time of American 1000-1500W probe-start MH lamps: Question « Reply #2 on: September 01, 2025, 06:01:28 AM » Author: dor123
I don't think the use of CWA or reactor should affect the warm-up period.
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I"m don't speak English well, and rely on online translating to write in this site.
Please forgive me if my choice of my words looks like offensive, while that isn't my intention.

I only working with the international date format (dd.mm.yyyy).

I lives in Israel, which is a 220-240V, 50hz country.

	Re: Run-up time of American 1000-1500W probe-start MH lamps: Question « Reply #3 on: September 01, 2025, 06:21:06 AM » Author: Medved
It does and a lot. CWA is a constant current, so when the lamp is still cold and its arc voltage low, the power dissipated in the lamp, so the heat warming it up, becomes low as well. On the other hand the series reactor and to some extend also HX autotransformer tend to operate very close to saturation during normal operation (to minimize the number of turns needed, so the wire length and so losses). This has the consequence of becoming partially saturated once the arc voltage is still low. And a saturated choke (or shunt in CWA) means the current becomes significantly higher than would otherwise correspond to the reactance it has at normal operation. And this higher current at low arc voltages means higher power dissipated in the lamp, so more heat warming the thing up, hence the shorter warmup time.
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	Re: Run-up time of American 1000-1500W probe-start MH lamps: Question « Reply #4 on: September 01, 2025, 08:32:49 AM » Author: dor123
@WorldwideHIDCollectorUSA: Can you compare the run up of your 1000W probe-start MH lamps on an M47 ANSI ballast and on an H47 HX ballast + Philips SI-52 ignitor.
« Last Edit: September 01, 2025, 08:57:56 AM by dor123 »		Logged

I"m don't speak English well, and rely on online translating to write in this site.
Please forgive me if my choice of my words looks like offensive, while that isn't my intention.

I only working with the international date format (dd.mm.yyyy).

I lives in Israel, which is a 220-240V, 50hz country.

	Re: Run-up time of American 1000-1500W probe-start MH lamps: Question « Reply #5 on: September 01, 2025, 02:27:26 PM » Author: WorldwideHIDCollectorUSA
I might give that a try if I find a 480V 1000W H36 mercury vapor reactor ballast and a suitable step up transformer and also a proper 1000W M47 probe start metal halide CWA ballast. I have read that some catalogs suggest that North American 1000W M47 probe start metal halide lamps can run satisfactorily on 1000W H36 mercury vapor reactor ballasts rated at 480V or very rare 1000W H36 mercury vapor HX ballasts with an OCV of at least 440V or higher if the ambient temperature is roughly 50 degrees fahrenheit or higher. So far, I once did have a 1000W M47 probe start metal halide lamp in my collection, but it sadly broke.
« Last Edit: September 01, 2025, 02:37:59 PM by WorldwideHIDCollectorUSA »		Logged

Desire to collect various light bulbs (especially HID), control gear, and fixtures from around the world.

DISCLAIMER: THE EXPERIMENTS THAT I CONDUCT INVOLVING UNUSUAL LAMP/BALLAST COMBINATIONS SHOULD NOT BE ATTEMPTED UNLESS YOU HAVE THE PROPER KNOWLEDGE. I AM NOT RESPONSIBLE FOR ANY INJURIES.