I have a Lightforce 240 Blitz mounted on the roof with a remote handle. Last week I replaced the bulb for a Osram Xenophot HLX 62138 G6.35 12V 100W and since then there is a "black hole" in the beam. Focusing does not work, the bulb is fitted straight and even with an other Osram 62138 the result is the same. What is wrong?