What are the consequences of driving a 150 watt sodium lamp on 100 watt choke? « on: December 28, 2019, 05:25:04 AM » Author: HomeBrewLamps
As the description says. I don't currently posses any medium base 100 watt lamps so I'm temporarily substituting a 150 watt lamp in for a few days or so. Will the lamp output 100 watts of light?
« Last Edit: December 28, 2019, 05:29:24 AM by HomeBrewLamps »		Logged

~Owen

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	Re: What are the consequences of driving a 150 watt sodium lamp on 100 watt choke? « Reply #1 on: December 28, 2019, 06:13:48 AM » Author: AngryHorse
I wouldn’t have thought so, with the 150 watt discharge tube being bigger, it will probably just under run without a full colour?
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	Re: What are the consequences of driving a 150 watt sodium lamp on 100 watt choke? « Reply #2 on: December 28, 2019, 06:25:27 AM » Author: HomeBrewLamps
Quote from: AngryHorse on December 28, 2019, 06:13:48 AM I wouldn’t have thought so, with the 150 watt discharge tube being bigger, it will probably just under run without a full colour? The American 150 and 100 watt lamp arc tubes are basically the same size so I'm almost feeling like perhaps electrically they may be atleast compatible enough to avoid damaging the lamp or ballast... Not sure though..
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	Re: What are the consequences of driving a 150 watt sodium lamp on 100 watt choke? « Reply #3 on: December 28, 2019, 06:33:35 AM » Author: dor123
You have two 150W HPS lamps: low voltage and high voltage. With low voltage 150w HPS lamp, the lamp will be underdriven, and with high voltage 150W HPS lamp, the ballast will overheat and fail.
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	Re: What are the consequences of driving a 150 watt sodium lamp on 100 watt choke? « Reply #5 on: December 28, 2019, 04:30:41 PM » Author: HomeBrewLamps
The lamp I'm run in is a 55V lamp on 55V gear. It seems to warm up slower than usual and settles on a color that appears to be fully warmed up. I currently don't have time to set up a test rig to compare the 150 watt lamp side by side with a 100 watt lamp and a 150 watt lamp driven on correct gears.
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~Owen

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	Re: What are the consequences of driving a 150 watt sodium lamp on 100 watt choke? « Reply #6 on: December 31, 2019, 01:15:31 AM » Author: Lightingguy1994
I was wondering this about using 100w lamps on 70w gear, both 55v Or 70w HPS on 70w MH ballast which worked fine before
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	Re: What are the consequences of driving a 150 watt sodium lamp on 100 watt choke? « Reply #7 on: December 31, 2019, 01:41:10 AM » Author: HomeBrewLamps
70 watt HPS on a 70 watt MH ballast I believe is very hard on the lamp. Either that or it causes the ballast to overheat.
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~Owen

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	Re: What are the consequences of driving a 150 watt sodium lamp on 100 watt choke? « Reply #10 on: January 02, 2020, 03:56:10 AM » Author: Medved
Quote from: HomeBrewLamps on December 31, 2019, 01:41:10 AM 70 watt HPS on a 70 watt MH ballast I believe is very hard on the lamp. Either that or it causes the ballast to overheat. Why should that be hard on the lamp? Lower current means lower efficacy, but lower stress. Higher OCV? That only makes the arc itself more stable, so in fact less stress on the electrodes during reignition. The thermal runaway problem is not there, because the lamp is just underdriven (my guess ~1.1A instead of the rated 1.5A) Ignition voltage? Once it is greater than the lamp needs, it is limited by the lamp anyway (as it is supposed to be the case). What may suffer is the ballast: Seing a 55V (or even below that, because the lamp will never warm up) means there is higher current than designed (my guess was ~1.1A instead of the designed 0.95A), so higher heat dissipation (15% higher current means 30% more heat). But because there is actually less heat from the lamp, the system may still be OK. So the lamp would be perfectly fine (although not performing), only the ballast reliability could be questioned...
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	Re: What are the consequences of driving a 150 watt sodium lamp on 100 watt choke? « Reply #12 on: January 15, 2020, 03:55:49 PM » Author: HomeBrewLamps
That's a good idea.. Never thought of that!
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~Owen

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