Those new Philips bulbs of the EFN type sounds interesting and would be worth a try. I read somewhere a long time ago that the new Philips EFN should be equal in specs to the old 13139.
Although the Osram is also of the EFN type and that didnīt work out very well. It is a bit strange since it is supposed to have been made to the exact same specs as the Philips bulb.
But 70 dollars for 10 bulbs is a true bargain if they would turn out to work ok.