Author Topic: What can be use to operate a 50 W MV lamp'  (Read 788 times)
Dnarb52
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What can be use to operate a 50 W MV lamp' « on: July 17, 2022, 04:41:44 PM » Author: Dnarb52
Gone through some ideas and insights on operating a 50 W MV lamp I did find a 50 w MH ballast but that may overdrive that lamp. However I did come across a 35W MH ballast for a two pin ( not screw in ) ballast, a Universal 50MLT. Any insights or thoughts of using this?
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Rommie
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Re: What can be use to operate a 50 W MV lamp' « Reply #1 on: July 17, 2022, 05:11:45 PM » Author: Rommie
Hmmmm. The current is the main issue with any discharge lamp, for a 50W MV (at least here in the UK) it's 0.6A at 90V or so. What do the ballasts you mention supply..?
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Medved
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Re: What can be use to operate a 50 W MV lamp' « Reply #2 on: July 18, 2022, 04:21:42 AM » Author: Medved
The minimum power rating of a probe start MH (so compatible with MV) I'm aware of is the 175W. All lower wattages are pulse start, so beside the presence of the HV ignitor (which could easily be deadly for an MV lamp, mainly at hot restrike attempt, so should be disabled), the rated lamp arc current of the MH is higher than the same wattage MV, so the MV lamp will be overdriven (ballasts are close to constant current sources, so higher arc voltage of MV would yield to higher real powr transferred to the lamp).

An exception could be electronic MH ballasts, which many (mainly the lower end ones) maintain true constant power. The higher end ones try to adopt the power so the arc voltage is constant, that way they maintain the exact arctube temperature regardless how much the arctube is blackened (so maintain the color properties pretty accurately even when the lamp is aging). But these MH ballasts use to be equipped also with an EOL protection (designed to shut the EOL lamp down before the risk of violent explosion increases) and this may assume the higher voltage of the MV to be a signature of EOL so shut it down.
Plus it uses to be harder to deactivate the HV ignition pulse generation in the electronic ballasts, as the HV ignition pulse generation uses to be way deeper integrated into the ballast circuit than with a simple "magnetic" ballast.
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WorldwideHIDCollectorUSA
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HID, LPS, and preheat fluorescents forever!!!!!!


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Re: What can be use to operate a 50 W MV lamp' « Reply #3 on: November 12, 2023, 12:48:34 PM » Author: WorldwideHIDCollectorUSA
A 35W M130 pulse start metal halide HX autotransformer ballast with the ignitor disabled might be a good option, but it runs the lamp at a somewhat underdriven state. Another way to possibly go about this is to use a 120V to 277V step up transformer and use a pair of 277V 26W 2 pin preheat PL-C CFL series choke ballasts in parallel.

Here are some parts that might work well in this setup:

Lot of 3 2 pin 26W 2 pin PL-C preheat CFL series choke ballasts (although you will only need 2 connected in parallel):

https://www.ebay.com/itm/203536315002

120V to 277V step up transformer:

https://www.ebay.com/itm/374970330806
« Last Edit: November 12, 2023, 12:55:29 PM by WorldwideHIDCollectorUSA » Logged

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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.

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