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Dimmable HID ballast


Best Answer Anonymiss , 03 April 2019 - 08:50 AM

One of my 250w ballasts has 4 settings, 275, 250, 190, and 125w, but I've only ever used 250/275 due to not having a clue how the bulbs will take the other settings or if a different bulb would be needed to run on them.

 
What's the make and model of the control gear?

I suspect that it may be designed for 250 Watt lamps, and that it might be able to run them at 110% (275W), 100% (250W), 75% (190W) and 50% (125W) of their rated power. Go to the full post


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#1 THC F13ND

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Posted 03 April 2019 - 05:18 AM

So I've just finished sorting a closed off 60x60x160 space specifically for breeding, and while moving stuff back in have spotted a crack in my 125w CFL bulb, one bad enough that it can be felt and doesn't seem particularly wise to fire back up. Bugger.

My T5 fixture is about 5cm too long to fit, and 250w HPS seems like overkill. One of my 250w ballasts has 4 settings, 275, 250, 190, and 125w, but I've only ever used 250/275 due to not having a clue how the bulbs will take the other settings or if a different bulb would be needed to run on them.

Seems like this'd be a good time to see if anyone else knows! :lol:

ATB
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#2 THC F13ND

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Posted 03 April 2019 - 07:30 AM

Morning dude, the weird thing is 190 and 125w HPS bulbs seem to, well..not really exist! The only reference to a 190w bulb that I could find was about street lighting being replaced with LED in Ontario, couldn't find any for 125w.

100, 150, 200, yep. But no 125 or 190 :wtfsign:

At this point I'm almost as interested in figuring out what those settings are actually useful for as getting a light going! Worst case I'll run 250w and dig out a fan or tilt the T5 as you say ;)

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#3 Anonymiss

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Posted 03 April 2019 - 08:50 AM   Best Answer

One of my 250w ballasts has 4 settings, 275, 250, 190, and 125w, but I've only ever used 250/275 due to not having a clue how the bulbs will take the other settings or if a different bulb would be needed to run on them.

 
What's the make and model of the control gear?

I suspect that it may be designed for 250 Watt lamps, and that it might be able to run them at 110% (275W), 100% (250W), 75% (190W) and 50% (125W) of their rated power.
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#4 THC F13ND

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Posted 03 April 2019 - 09:24 AM

It's unbranded, but there is a model number; H1-250E2-AV.

Front - Attached File  Screenshot_20190403-101947.png   1MB   0 downloads

Back - Attached File  _20190403_102047.JPG   52.48KB   0 downloads

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#5 duke

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Posted 03 April 2019 - 09:54 AM

that looks same as my no name cheapy and that seems to work with the standard bulb dimmed just fine i believe underpowering is ok but not overpowering size of fitted bulb,good luck


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#6 Anonymiss

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Posted 03 April 2019 - 10:15 AM

I can't find anything about that particular model, @THC F13ND, but the label does say "Lamp: 250W MH/HPS" so I suspect that it's "dimmable"

I might not try underpowering a metal halide though.
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#7 THC F13ND

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Posted 03 April 2019 - 10:30 AM

Oh no, I wouldn't chance it with a halide, they don't take it well as I understand it ;)

I've got a few spare 250w dual spec bulbs lying around though so it's worth a go I think.

Taking the settings as percentages, the wattages don't seem so random as they did at first glance. I'll give it a go in a bit and report back :)

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#8 denots

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Posted 03 April 2019 - 11:10 AM

@Anonymiss I've always used a 600w MH's dimmed down to 400w for years. Never had any trouble.........yet.

 

 

@THC F13ND If you ballast allows 125w and 190w bulbs, I'd use a 150w bulb if you can get it, on the 125w setting. Maybe worth a try mate.


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#9 Anonymiss

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Posted 03 April 2019 - 11:17 AM

@Anonymiss I've always used a 600w MH's dimmed down to 400w for years. Never had any trouble.........yet.

 
Fair enough - I just didn't know one way or the other :)
 

@THC F13ND If you ballast allows 125w and 190w bulbs, I'd use a 150w bulb if you can get it, on the 125w setting. Maybe worth a try mate.

 
The label only mentions 250 Watt lamps so I'm pretty sure that's what it's designed for, and it may be that the electrical characteristics of lower-powered lamps are different and somehow not compatible with those of higher-powered lamps run below their rated output.

I'd go for a 250 Watt HPS, which I'm sure will work (and, at worst, will probably simply not strike/start at the lower settings) :)

The CCT will, however, probably be shifted towards the blue end of the spectrum when run at less that rated output, and slightly towards the red when over-powered.


eta: Looking at Philips brand HPS, their 150 Watt and 250 Watt lamps seem to have the same Voltage characteristics, but only the 250 Watt versions are rated as dimmable - the 150 Watters aren't.
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#10 THC F13ND

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Posted 03 April 2019 - 11:28 AM

I get what you mean @denots, a 150w run @ 125w = ~85% power, would likely mean more useable light compared to a 250w bulb @ 50% power.

I'll definitely give the 190w setting a go as I've plenty of 250 bulbs, but if it can run a 150 that could be handy to keep in mind, summer is coming. Winter too of course :P

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