HT2050 = W1110 = 15,000 CR = 2200 lumens
HT3050 = W2000 = 15,000 CR = 2000 lumens
HT4050 = W3000 = 10,000 CR = 2000 lumens

http://www.benq.com/product/projector/w3000/features/

http://www.benq.com/product/projector/w2000/features/

http://www.benq.com/product/projector/w1110/features/