dslreports logo
    All Forums Hot Topics Gallery


how-to block ads

Search Topic:
share rss forum feed

Sunnyvale, CA
reply to tschmidt

Re: Interesting article about the state of lighting.

said by tschmidt:

For my part just finished converting all our 4' dual florescent 40W T12 magnetic ballast fixtures to 32W T8 electronic ballast. I'm very pleased with the result. Same amount of light, instant on, no flicker and about 1/2 the power consumption.

How did you get to 1/2 the power consumption, did you reduce the number of fluorescent tubes ?

I have a kitchen light fixture with 6 T12 (40W 4ft) that I will need to replace eventually. I have been thinking about keeping the same fixture and just replacing the ballasts (using 6 T8 bulbs with 32W). However that would only result in a 20% power saving.

Of course, I'm also thinking about LED lighting.
Got some spare cpu cycles ? Join Team Helix or Team Starfire!

Milford, NH
·FirstLight Fiber
·Hollis Hosting
·G4 Communications

2 edits
said by leibold:

How did you get to 1/2 the power consumption, did you reduce the number of fluorescent tubes ?

I used GE UltraMax L series ballast.
»genet.gelighting.com/LightingObj ··· ecId=176

Claims to use only 49 W with 2 tube. Given the series has multiple ballasts I'm assuming they are running bulb at less then maximum wattage. From what I have read about T8 retrofits they are brighter then T12 so I took a chance. Visually they look the same but that is logarithmic. My wife has a light meter for plants so in an unscientific test of light output they seem to be about the same.

They are available at subsidized prices through the NH saves program for $14 a ballast for two tube unit.

T8 tube prices are all over the place $2-6 per tube. I found a contractor package at Lowes.

»www.lowes.com/pd_291833-3-22265_ ··· cetInfo=

The Sylvania site says they do not meet 2012 energy requirements but have been grandfathered due to rare earths shortage. I don't understand since the Lumen output is the same as much more expensive bulbs.
»www.worldelectricsupply.com/Cust ··· 2%29.pdf

I believe a 2-tube T12 magnetic ballast comes in about 90W. Which is how I came up with the 50% power saving, I did not actually measure it.