Oh I see, you actually cut the neck off the CRT and put the bulb inside.
Did you strip the phosphor off the inside of the monitor? That will go a long way to letting more light pass through. Not exactly sure how you would go about doing it without direct access to the back of the CRT display area. I'm sure some kind of chemical stripper would dissolve it as has been done for at least one LCD Mac mod.
How did you cut the neck off? With a diamond wheel Dremel tool?