Lighting problem BC after lamp change!

Hello dear Omiga community, have a problem with the illumination of the board computer which is again as follows: Since I have now found in the winter that I have a consumer who eats my battery empty, it was clear to me that this is the lighting of the BC, because I replaced the original lighting in the summer against blue lamps and at night it was obvious that they still got power, so they have lighted the BC still quite easily despite switched off ignition. Now I have again the Phillips lamps installed, but what do I have to say I turn the first lamp pure lights great, I turn the second pure the two lamps become weaker, then the third I think I spin still weaker, yes and when all four are in there you can see nothing more at the BC?!?!?!!? now I only have two lamps in it = under tags when it is bright I see almost nothing, in the night when it is dark it goes, but that can’t be, that’s the original Phillipslam pen which were inside in the omi from house, only with every lamp that I turn more in also more luminosity is lost………. what can be there, is something broken here? Thanks for your ideas and tips schany