I had a similar problem on me sapphy, in that the glovebox light wasn't worth having!!
It really didn't illuminate much at all, like the interior lights.
I did something about it though, a lot of aftermarket led's are crap, after trying loads as a flashaholic, most are this blue crap that doesn't give out much light, but the ones I now use are awsome.
I get them from dealextreme.com, where they are item number 15648, they cost £4.35p, it is a 12led flat disc about 1 1/2" in diametre, intensely bright.
I have fitted one in the glovebox, with the supplied bulb adaptor(wedge bulb), I simply "wound" the wire slightly so that it sits fully under the led unit, which is 2mm to 3mm high, with a super sticky pad on the rear, you can easily see the light in bright daylight, let alone night time.
I also fitted 2 in the front either side of the sunroof handle, and one in the rear on the std rear interior light, though had to drill the metal bulb holder to fit this one, as no adaptor to fit.
I have my interior lights wired so that the front ones when illuminated/turned on from switch on light also lights rear one up but the rear when turned on does not light the front one, so in the back can have the light without me being dazzled in the front.
Trust me these babies dazzle, they have just the merest hint of blue, they light the pavement through the windows of the car, when the doors are opened they light the floor well, they don't get hot either.
I also used these on the other halfs car, and ordered some more for the boot of the sapphy, and underbonnet.

tabetha