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Lithonia 2' Shoplight

Lithonia 2' Shoplight

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A Lithonia 2x20W fixture from ReStore. It has a reflector, but it's so stubby it might as well be a striplight. It didn't include a cord, and has no knockouts besides a rectangular opening and is listed as a "portable lamp", so I assume it isn't meant to be hardwired. There was something loose rolling around inside, and fortunately that turned out to be the bushing for a cord. I wonder if these were sold as general shoplights or if they were for some special purpose.

diag-troffer.jpg cooper2ft.jpg lithonia2ft.jpg metalux-ballasts.jpg

Light Information

Light Information

Manufacturer:Lithonia Lighting
Lamp
Lamp Type:Fluorescent
Fixture
Ballast Type:Advance Rapid/Trigger Start
Electrical
Wattage:2x20W
Physical/Production
Fabrication Date:1999

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Album name:Patrick / Fluorescent
Keywords:Lanterns
File Size:273 KB
Date added:Mar 04, 2014
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xmaslightguy
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Mar 05, 2014 at 07:15 PM Author: xmaslightguy
I have one of these (bought new).. they were just sold as shoplights.
Actually in a way I have 3 since I also cut one of the 4-foot version in half & turned it into 2 2-footers (done before I saw the 2-foot version in stores)

Colored Fluorescent's such as F40T12 Red or  Green or Blue are awesome...

ace100w120v
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Mar 05, 2014 at 07:42 PM Author: ace100w120v
Maybe for growing plants?
xmaslightguy
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Mar 05, 2014 at 09:28 PM Author: xmaslightguy
Guess it'd make a plant-light...but it'd be better if you swapped out the LPF ballast for a HPF

They were just on the shelf next to the 4-foot version.

Colored Fluorescent's such as F40T12 Red or  Green or Blue are awesome...

themaritimegirl
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Mar 05, 2014 at 10:52 PM Author: themaritimegirl
Cool! What model is the ballast? An RL-2SP20-TP?

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Patrick
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Mar 09, 2014 at 03:04 PM Author: Patrick
Yep, RL-2SP20-TP. My Kill-A-Watt meter reads 35W for both. New HPF ballasts for 2x20W are expensive! I've seen them listed for $50-$75. I'll be looking for used.

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toomanybulbs
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Mar 09, 2014 at 03:10 PM Author: toomanybulbs
is it just me or are all 2x20w shoplite ballasts underdriving garbage?
i have 2 of those and they were so dim and fussy that i tossed the ballasts thinking they were just bad.put in motorola electronic "hi light" that have a bf of 1.2
even with less efficient /950 tubes they are about 3 times brighter.
umm i think i got my answer.
http://www.platt.com/CutSheets/Advance/RL25P20TP.pdf
.61 bf with 20w lamps!
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Mar 09, 2014 at 03:12 PM Author: themaritimegirl
I got the same ballast (Canadian Philips-branded version) in my 2x20 strip light. Fine and dandy ballast, quiet and runs cool, but very weak - ballast factor for 20 watt lamps is 0.61! That's 12 watts of power per lamp! Advance makes an HPF version of this ballast called the HM-2SP20-TP, and it has a much better 0.90 ballast factor with 20 watt lamps.

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Patrick
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Mar 09, 2014 at 03:19 PM Author: Patrick
Yes, none of them are any good it seems. I think it's a design limitation of of an NPF two-lamp series ballast for 15/20W lamps. I think if it drove 20W lamps properly, it would overdrive 15W lamps and likely overheat. I'd think a 20W-only NPF ballast would be OK, but perhaps the market is too small. The capacitor in the HPF ballast enables the ballast to maintain about the same current, thereby allowing it to drive both lamp sizes well.

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Mar 09, 2014 at 03:29 PM Author: themaritimegirl
You pretty much hit the nail on the head. If I remember right, LPF ballasts (in general) aren't able to regulate their current over a range of lamps as well as HPF ballasts, so they must be designed in such a way that they won't overdrive the smallest lamp they are rated for, making them rather weak for larger lamps. The RL-2SP20-TP is a fine ballast for an F13T8 or F14T12 setup, but pathetically weak for anything larger. As you said, they could make separate ballasts to cover separate lamps, but it's probably cheaper not to do so.

I just looked on eBay; you can grab a new HM-2SP20-TP for $19 shipped. If you're considering an Advance at all, that is.

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Mar 09, 2014 at 07:53 PM Author: ace100w120v
I've always assumed those 14-15-20 ballasts (both preheat and trigger start) slightly overdrove an F14T12, ran a F15T8 or F15T12 at full power, and a F20T12 underdriven. Am I wrong then?
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Mar 09, 2014 at 09:02 PM Author: themaritimegirl
You're mostly right. LPF ballasts are usually designed so that the smaller ones are driven correctly, and the larger ones are underdriven. For example, the RL-2SP20-TP ballast factor ranges from 1.0 for the F13T8 to 0.61 for the F20T12. In the case of HPF ballasts, however, ballast factor is relatively even across the range of lamps. The HM-1P20-TP averages 0.86 across it's rated lamps, and the HM-2SP20-TP averages 0.92.

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Mar 09, 2014 at 09:21 PM Author: xmaslightguy
@ace100w120v:
That's a good question, and you are probably atleast close if not correct I do know they run allot hotter with F14's than with F20's.


--
I have one 2xF20T12 striplight that came with the usual LPF ballast...I ended up changing it out: re-wired so the 2 lamps were in series, then took a 2xF32T8 ballast and wired it for 2x overdrive - so it "sees" a 4-foot lamp (with this T12 lamps are then around the brightness of a HPF ballast)

Colored Fluorescent's such as F40T12 Red or  Green or Blue are awesome...

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120V/240V 60hz


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Mar 09, 2014 at 09:45 PM Author: paintballer22
I have a shop light similar to this that is damaged so I am going to try to make a 15in F14T12 out of it.
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