He's from Romania for god's sake... not Cleveland.
As long as the new EU "rule" of 0.3 W/mē Eeff cap does not apply to your "grandfathered" beds/booths, you can put anything stronger in there you want. Your local lamp seller should be able to recommend a higher UVB lamp with maybe 3 CIE MEDs in 10 minutes.
That would be about 4 FDA MEDs in 10 min... or 24 MED/hr dose rate. In EU 3 CIE MEDs = 600 J/mē which = 1.00 W/mē x 600 seconds. Got it?
If not.... then you need one of these:
http://www.solarmeter.com/model75.html