I have ordered the new LED bulbs with E14 and B15 socket. They work very well and give lots more light than the old 15 watts. The light comes off as slighly bluish to me but within what I find acceptable (they are actually marked as "warm white" or "bright white"). It makes a big difference when sewing with black thread on black fabrics. I like the integrated lights on these machines, and the new bulbs are an improvement.