These bulbs are extremely hot(they can melt themselves!), and produce tons of unusable light, just like the sun(roughly only 25% plant-usable/PUR/PAR). They were created back in the early 90's and were deemed a commercial failure.. still in the 90'S.
LEDs are clearly the future of lighting for quite a foreseeable time. They have the highest luminous efficiency(while still producing good light, sorry LPS), and are 'tunable' to various wavelengths. Plus they are the most directional light source(normal bulb radiates 360 degrees, an LED is less than half of that).