A new way to make a more white light has been discovered by researchers at Sandia National Labs.
They have mixed four different diode lasers to produce a bright white, warm light that they say is by far better than incandescents and an evolution from LEDs. This new white light is the laser light bulbs.
While the combined beam of these four lasers (red, blue, green and yellow) may be a beautiful white, it is not likely that you will see an actual white laser anytime soon. Indeed, white light being a combination of all colours, does not lend itself to being produced by lasers, which specialise in emitting light in single, very narrow wavelengths.