In the past this was with Semicom Lexis, with their Hyundai generic brand, later Nisko, with their Sunlight generic brand.
And now this is even reached to a more known brand to the european and members of LG outside the US, Canada and UK: Eurolux.
Yes, Illumina, the importer of Eurolux lamps to Israel, began to state in their new site, that Eurolux CFLs are liquid merucry free, while these lamp have even don't been dosed with amalgams.
What do you think? Is Illumina true with their state that "Eurolux CFLs are liquid mercury free"?
Update: Another thing that i discovered, is that in the new site of Illumina, states that the Eurolux CFLs are RoHS compliant while this isn't stated in Eurolux website.

If it is mercury free, what substance does it use to heat up and increase pressure while producing light ?

"Liquid mercury free": This sounds like an amalgam lamp. I don't know, what is the background for the "while these lamp have even don't been dosed with amalgams." statement, it is not clear from your description.

"RoHs compliant": RoHs directive exempt the use of the mercury as an active material inside the light producing devices, so in this case it mean, then no other "hazardous substances" are used in the lamp (e.g. radioactive ignition aids, PCB's,...). I'm not sure, if this automatically cover even lead in the solder alloy, as electronic for lighting (together with safety critical automotive and body implant electronic) was at least some time ago exempt from the lead ban, i don't know the status of today.

@Medved: James told me in PMs discussion, that there is some misleading about solid amalgam CFLs having not contains liquid mercury and are safer to the environment.
He wrote to me that in lamps dosed with solid amalgam instead of liquid mercury, the amalgam pellet is heated in the final stage of the production. During the heating, the mercury vapour releases, and after cooling down, the vapour don't returns to the amalgam pellet instantly, but condense on the tube wall as a liquid mercury instead.
Indeed, if a buyer bought a CFL that skipped the final amalgam pellet heating stage, his lamp will remain at merucry satrved state for a long time and will reach to full brightness only after a hour or so.
As far as i know, Eurolux lamps dosed with liquid mercury only and not by amalgam pellets, and regardless how the lamp dosed, it will have a liquid mercury traces and mercury vapour when cold or hot, but when cold, in amalgam pellet CFLs, the mercury pressure will be sometime lower than when hot.
My Hyundai TEVA helical CFL, have no run-up time when it is switched on from cold state, indicates that the merucry pressure of it when cold is the same as when hot.

Many triple tube CFLs use amalgam. If you shake a 26W Philips PL-T, you actually hear something rattling. It's a small amalgam ball.

Twin-tube or PL-C is not. 

Amalgam slows down warm up, but it resists output drop from high ambient temperature. It maintains practically 100% output at temperature as high as 130F. 

@dor123: It depend, what other metals and in what ratios form the amalgam.
So indeed, some amalgam may serve the only purpose to allow small, but accurate mercury dose during lamp manufacture (as the mercury is diluted, the dosing machine could chop rather big piece of material, what is then quite accurate operation), then after initiation (the mercury release) the pellet play no role anymore. I would guess this concept to be used on cold running, low mercury dose lamps. With this concept it does not matter, on what temperature the pellet run during normal lamp operation - as it is already inert.

But with another compositions, the amalgam would play the role of the cold spot and control the mercury pressure during operation (once was used In stripe coated on the tube few cm from the end - described e.g. here). This concept is then intended for high and/or wide temperature operation (depend on the amalgam characteristic and the way, how is controlled it's temperature).
With this concept (if the amalgam is designed for high temperature operation), most of the mercury condensed back to the amalgam, so it is not present there in liquid form.

@Luminaire: I don't hear a rattling sound when i shake my Philips Tornado and Hyundai Teva helical amalgam lamps, but i indeed saw a ball inside the Philips Tornado.
@Medved: This is too complicated. James can explains this better.
Since i discused him by PMs, you can't see what he said to me.
Several LG members have more knowledge than others.
Also Medved, remember what James said to me: If a buyer brought a CFL in which it liquid mercury returned to its amalgam pellet or skipped the final amalgam heating stage, it will complain, that his lamp takes hours to reach full brightness.