These new units are a great alternative to conventional fresnel lanterns. They have a 75w RGBW LED chip, which gives great colour output. They have a zoomable spot beam, which is manually adjustable from 10 degrees to 50 degrees.
The optics give a smooth, even, soft-edged beam which is ideal for subtle stage lighting. The colour mixing is fully controllable via DMX. Using white in addition to the RGB gives much more natural face light and makes lighter pastel shades easier to achieve.
Power consumption is far better than traditional incandescent bulbs, and if your show requires a range of colour washes, you can cover everything with far less lanterns.