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What ballast to use ?

What ballast to use ?

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I want to run European F18T8 lamps using preheat ballasts. I am confused (even more so now that I looked at ballast factors) about which one will give me the most lumens. I have also compared this with the Advance LC25 from 1000bulbs, and the current specified is the same at 0,35A. Both of these are, however, rated all the way down to the F14T12, so I am assuming a F20 would be under driven. On the other hand, a European retrofit 18W lamp that is triphosphor would in theory be brighter than the halophosphate F20T12 it replaces. Any advice regarding a solution would be greatly appreciated.

inno2.jpg IMG_6078R_copy.jpg IMG_0412R.jpg a2.jpg

Light Information

Light Information

Manufacturer:Standard Pro and Robertson
Electrical
Wattage:14-20
Current:0,35A

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Album name:sol / Various
Keywords:Gear
File Size:470 KB
Date added:Aug 12, 2015
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funkybulb
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Aug 12, 2015 at 11:00 PM Author: funkybulb
Any preheat F20 ballast can drive the 18 watt 2 foot tubes. U know we get these halophosphate 18 watt tubes sold as appliance lamps. Such as F24T8

No LED gadgets, spins too slowly.  Gotta  love preheat and MV. let the lights keep my meter spinning.

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Aug 12, 2015 at 11:04 PM Author: Solanaceae
I have gotten the cheap unbranded Chinese f18 t8 tubes from under cabinet lights and successfully ran them on a choke.
Also using an f17t8 octron tube on these makes for a crisp, bright light.

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sol
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Aug 13, 2015 at 05:53 AM Author: sol
Sorry, I wasn't all that clear with my explanation. What I am looking for is to operate a German Osram Lumilux 18w lamp on one of these chokes. I know it will light as I have some already but they are colour 954 and not that bright. I am thinking the lack of brightness is due to the 90 CRI. I am waiting for a shipment of 840 lamps, and hopefully the CRI of 80 will be brighter. Would a LC-25 choke make the 18w lamps brighter ?
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Aug 13, 2015 at 04:50 PM Author: Al_M
I guess over-driving any tube will make it brighter, at the expense of lamp life though.

Traffic signals & street lighting engineer. Please bring SOX/LPS back Downunder!!

themaritimegirl
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Aug 13, 2015 at 05:40 PM Author: themaritimegirl
I assume you have no Kill-A-Watt or the like, then?

The rated current on chokes is usually for the smallest lamp they are rated for - in this case the F14T12. For the F18T8, neither of the pictured chokes will drive close to that value. I'd say closer to 0.25 - 0.30A.

The Advance LC-25 is for the F25T12 appliance lamp, and is way more powerful than a 14/15/20 choke. Don has tested them, and they push about 0.36A through an F20T12. An F18T8 will be similar. The F18T8 is rated for 0.385A, so you're still not overdriving it!

Conclusion - Go for the LC-25.

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Aug 13, 2015 at 05:43 PM Author: Solanaceae
I need to find an LC-25, I have tons of those f25 tubes waiting to be used.

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sol
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Aug 13, 2015 at 06:14 PM Author: sol
OK, that makes sense. I'll have to find some LC-25 to use in this application. I do have an equivalent to a Kill-a-Watt meter, just have to find it to test...
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Sep 30, 2015 at 12:45 PM Author: sol
Well here's an update. I still can't find my watt meter, so that's out for now. I ordered LC25 ballasts from 1000 bulbs, but they don't stock them anymore, so that's out as well. I ended up installing the Robertson as it drives the European F18W better than the Standard one. It seems pretty bright, just enough for my application. There wasn't a whole lot of difference between the two, but the Standard one had less preheat current and the lamp would flash for sometimes 10 seconds on cold starts (that is too much, even if I like the blinks). The Robertson one starts on 2-4 blinks, and has less flicker than the Standard one.
don93s
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Oct 01, 2015 at 10:30 AM Author: don93s
Those LC-25 ballasts are still available on eBay. That's where I've been getting mine.
sol
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Oct 01, 2015 at 01:35 PM Author: sol
Yes, but they don't ship to Canada.
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Oct 01, 2015 at 05:58 PM Author: don93s
Oh, I hate when that happens! I could never figure out why shipping on the same continent is such a big deal, but I guess customs, tax, etc. makes it big deal. Anyway, this other one says will ship to Canada. For me it says free shipping but for you it might be different.
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Oct 01, 2015 at 07:10 PM Author: sol
OK, so I'm being fussy here. I have seen that one, but for my project, I need at least three, maybe four. I hate ordering one and then waiting for more listings. There is another listing but they are marked as used, and ship only with UPS which is a no-no here as they charge exorbitant amounts for a customs broker (around 50 dollars for the broker to pay less than five dollars duty).

The Robertson from the picture seems to work quite well in this application, so unless something else comes up on eBay, I will keep it like it is for now. In case you are wondering what I am up to, it is for kitchen under cabinet lighting. I am replacing the original fixtures that have Robertson electronic ballasts of which one of them had an EOL lamp and melted the end of the diffuser. They also use appliance lamps that are only available in standard halophosphate cool white with a CRI of 62 which is not enough for me. The original fixtures are Linogène and one of them I have trouble keeping the diffuser on.

With all that said, Don, thank you anyways for your help, maybe I'll be able to find something someday.
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