We had a chance to test and compare two models: Optoma UHD51A vs Optoma HD27 and this review should help people who are looking for a good projector. Based on our rating, UHD51A has a total rating of 9.6 out of 10 versus 7 for HD27.
Advantages Optoma UHD51A over Optoma HD27
Bring the cinematic 4K UHD experience home with the UHD51A
UHD51A is HDR-compatible
Wireless connection enabled
More USB ports: 3 vs 1
Stereo sound vs mono from integrated speakers
Advantages Optoma HD27 over Optoma UHD51A
Better brightness: 3200 vs 2400 lumens
Lower noise level, 26 dB vs 28 dB
Lower power consumption, 260 W vs 317 W
Longer lamp life (normal mode): 5000 vs 4000 hours