Difference between Premium Luster Photo Paper and Premium Semigloss Photo Paper

[Christopher]

I just wanted to know if there are any deeper difference between both papers?

I have printed and new samples here and they look pretty much the same. So far the only real difference I can find is that Premium Semigloss Photo Paper is only available in A4/50 - A3 sheets and Lustre is available in A4/250 only A3+

Anything I missed ? (besides 251g vs 260)

[NikoJorj]

Quite close indeed...
- a tad less OBA in the semigloss according to http://www.pusztaiphoto.com/articles/printing/spectrums/webchart.aspx
- a slightly different surface aspect, the semigloss is finer and smoother to my eye, that makes me prefer it (but not from far).

[deanwork]

I don't know. The semi-gloss has a nicer texture in that it doesn't have that pebbly texture that luster has, which has always driven me away from the PL. For big things that isn't a major problem, but for 16x20 and smaller I just don't like that machine texture of PL, it looks so mechanical and industrial. If the Semi-Gloss has less oba that is new to me. If you compare the two under a daylight balanced proofing light the semi-gloss just has this very odd cyan hue to the base that I find ugly (not visible under tungsten). I assume that is why it never took off and became popular and demanded in rolls. The Hp Pro Satin  rc has a perfect texture and great gamut and black point without that machine texture pebbling (perfect texture and no reflections as gloss media has). However, in fade tests it doesn't hold up as well as Epson Premium Luster due to oba burning out in the Pro Satin. In my experience there is yet to be a perfect rc semi-glosss media offered by anyone. I haven't tested the Moab or Canon media however. Apparently the Canon is holding up better in Aardenburg fade tests for the white base loosing its punch when exposed to uv light. It is worth testing the Canon rc to compare.