Casio is definitely a leader in solid state light engines. They’ve been offering an extensive line-up for several yeare. We reviewed their first series about five years ago. Casio claims to have the largest market share in terms of serious solid state projectors (excluding all those tiny pico and pocket projectors).
The light engines Casio uses are “hybrids” where they use both a blue laser and a red LED, and use phosphors excited by the blue laser to produce the blue and green primary colors along with the LED's output for the red primary color.
The EcoLite XJ-V1 is the first and only projector we have seen in this price range that offers a hybrid light engine with reasonably high light output.
Laser/LED light sources have the advantage of being much more stable over time, in terms of light output and color characteristics, than do traditional lamps.