halo4dHALO® 4D Fractional Laser Resurfacing. Two different lasers are combined in the HALO 4D. The Halo® fractional laser delivers two different wavelengths, 1470-nm and 2940-nmNEW METRIC HALO SOFTWARE: Introducing the MH Production Bundle v4. The Essential Toolset used by Grammy® Award-Winning Engineers and #1