I don't think a new lamp would help. The projector is not worth the cost of a lamp. I have an old VP 6120 that has a great picture and works great but has over 3000 hrs on the lamp and I can't give it away no one is intrested. Look on ebay for 1024 x 768 projectors and you'll find many for less than the cost of a lamp.
"Smart enough to know better, to old to care" ------ Dedicated Home Theater, Mitsubishi HC7900DW Projector, 110" 16:9 Jamestown screen with variable power masking for CIW 2.50:1 to 16:9, Marantz 7009 with 7.1.4 Atmos with Ohm mains,3 DIY Subs (2 15" (1 ported, 1 sealed and a 12" 4th order bandpass), 1 DIY butt kicker, Custom Built HTPC, 10TB DroboFS NAS