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Replacing the screen of a Compaq Portable 486c

I think I can see how to calculate it, The brightness on the website it said is equivalent to a 40W incandescent
According to my calculation based on the information on the box, An F6T5 6W G5 4100k 9" Frosted CCFL would be~260 lumens, +/- ~5%.
If it's equivalent to a 40W incandesent, wouldn't it be more akin to 460 lumens?
 
According to my calculation based on the information on the box, An F6T5 6W G5 4100k 9" Frosted CCFL would be~260 lumens, +/- ~5%.
Wow, thanks! So with a little more lumen it would be perfect abt. +-300 lumen.

Beside that, I'm curious also on the calculation...
 
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