It looks like an HPS bulb.
The reflector looks dirty, that costs you some light intensity, which would have helped for bud density. If you got some coin I'd buy a nicer reflector, or if this is going in your box you'll probably need to do some sort of cool tube.
How big of an area is that 400 covering? Too big a space also will lead to less dense nugs.
You need to pheno hunt through some quality genetics, get some mothers, then get those dialed in.