Why would you regard this as spam? I think it's valuable information for photographers who exhibit their work.
Solux is certainly a respectable brand name. The only thing I find slightly off-putting is the sales-pitch tone rather than strictly information. The segment does raise some questions that I'd like answers to.
For one, I'd like to see a comparison between the 3500K light and an equal amount
of whatever the other lighting was. Simply covering one of the lights (the "3500K" one, presumably) made both prints look darker, so how can one tell anything about the effect of the color temperature on the vibrancy of the color? A clear A-B test, with X-watts of 3500K Solux vs. the same wattage in Solux 5000K bulbs would be informative.
If one adjusts one's prints to look as good as they can in a conventional D50 or D65 viewing station, will they still look better viewed under 3500K lighting?
And finally, I wonder why
the 3500K "looks better" than conventional lighting. Is it something about the color sensitivity of the human eye?
I find the notion sufficiently intriguing that I will probably buy a few Solux bulbs and adapters and see what things look like to me. If and when I do, I'll certainly report back here. If anybody else does such a comparison, I'd like to hear their views.