I don't have any experience with the lamps in these Kenwoods, but I have a Yamaha CA-810 I re-lamped with the correct lamps and it looks dim to me. However, it seems that's the way it was intended to work.
If I was more ambitious I would replace them with LED's. I used white LED's in a CA-2010 and they are much, much brighter. Both Yamaha's have a blue plastic filter, which diminishes the light output somewhat.
So you may want to try LED's.