Aren't those like 300 milliwatts?
300 mW / sqft?
I'm using 50 W / sqft.
It's an interesting idea to provide a single wavelength source - but thats also what LEDs do, but in more power.
Effectively, HPS lamps are nearly single wavelength - the sodium spectrum is spiked in only 2 spots.
A Laser pointer just doesn't have the power.....