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[quote=DB Custom]
Pretty simple and obvious question with a very complicated and not so obvious answer. To get white light, equal parts of the color spectrum are mixed. Output from lasers is very distinct, a particular wavelength, but to control the effective output is perhaps more complicated than it would seem. Easy to put out a large amount of green light, not at all easy to produce an equal amount of red light, and blue is also not easy to make the output match green. The resulting mix of color, IF the outputs are matched through a great deal of effort, is not the white light you would want to use as a "flashlight" because of the 3 specific wavelengths mixed instead of an equal amount of all light. And then of course there's the radiation, the part that is damaging to animals (human's are animals too of course!) So, level of difficulty, expense, and dangerous output are the 3 primary reasons it's not done. (This is of course my take on the subject, accuracy may deviate from actual truth based on factors beyond my control, ie: how fast have I drank this mornings coffee...)
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Actually the technology has existed for some time in laser DPSS projectors using wonderfully magic devices called dichroic cubes as a compound multiprism for generating white light from three independent RBG laser sources... a fellow named “thunderf00t” on youtube has an excellent video of their properties, and they are ultra cheap (under $20) on ebay ...
EVERYONE HERE SHOULD SEE THIS ITS CRYOGENIC COOL...
https://youtu.be/GkvgkrCSIX0
however, the mechanism of laser excited phosphor works, instead of using direct electrical current to excite an LED to produce blue light, striking the yellow phosphor, which in turn reflects the many subtle variations of white tint and intensity of spectral white (to be then reflected, etc)....
LEP uses a powerful focused 445nm blue laser to excite the same yellow phosphor, so its an LED that is not directly electrically driven at ALL, driven exclusively by intense collimated photon light energy output...
the technology is in in infancy now, but BMW are pursuing it as the current future tech of automotive state of the art lighting systems, superior in so many ways to both the former reigning champion technology of metal halide HID back in the 1990s and very recently the EXPLOSION of permeation of very high output white LEDs as a primary headlight light source...
I was sooooo excited in when Osram developed its first Ostar white LED, first to achieve over 600 lumens from a single discrete LED, when the (then Luxeon, which held market supremacy the same way Cree does Now) rest of the field was challenged to reach the 200 mark... maybe ten years ago? Im old, cant remember exactly.... that i knew it would be within a few years to have discrete LEDs powerful enough to be used as automotive headlights...
Likewise, the emerging laser emission phosphor LEP technology is poised to leapfrog LED to provide a quantum leap ahead in candela intensity if things continue to evolve as i sense them...
.....too much throw is NEVER ENOUGH, and LEP promises to be an exciting future directly immently ahead, although Now limited in power, just wait a while....
By the way, Dale, i hold you in highest regard for your relentless pursuit of insane overdrive phosphor scorching lumen output in all your mods, particularly of the Emisar D4S.... YOU ARE A MADMAN IN THE BEST WAY and i would love to be able to contract your modding services, since a stroke has robbed me of my ability of doing precision soldering work or component assembly, so im now a handi-modder in a sense. Many Cheers for your talents and abilities!
i would love to hear the opinion of Enderman, whom i hold in Diety status on this forum for his relentless ingenuity in pursuit of the most extreme performing LED systems and engineering skills par excellence! I am always slack jawed by his encyclopedic knowledge base and DaVinci inventors gifts... Cheers to you, my friend...
and Cheers to the entire BLF community, its wonderful to have such a concentration of talent hobby enthusiast in one place to continuously educate and entertain.
Long Runtime and High Candela for All :-)