Yeah this one is from 2005. (I think i may have written the date on the endcap. When someone decodes a lamp for me I'll write the date on one of the endcaps near the pins.) Sylvanias with this style date code are easy to figure out the year since i think the second character (5) is the last digit in the year. I don't know how to crack the decade but usually you can take a guess at it. Since this has (Hg) on it, it has to be 2005. I think someone had dated this one for me though so if there's a month too that's why.