People get hung up on how many watts and how many Lumens without understanding what they are for.
- It think your being a little over zealous in your analysis of the spectral graph from phillips website. Indeed i think you don't know what lumens are and what that method of measurement is used for.
-The graph lists relative energy clearly on the left, meaning that it's normalized over the wavelength. E = ch/Lamda(wavelength), but in this case they are just using RE = ch. Just thought I'd point that out.
- I find it EXTREMELY HARD TO BELIEVE that a lamp putting out 39000 lumens, 3/4 of what a phillips hps alto puts out @ 50000 lumens has a higher relative energy at every wavelength in the visible spectrum and does it at a cooler temperature. No way imho.
- See that big green spike in the middle of your wonderful retro white's SPD, that's totally useless light, and you can subtract that from all the performance numbers phillips puts out. (btw since human eyes are optimized for light around 500 nm "green", and lumen is a measure of the perceived power of light, adjusted to human eyes, it makes up a large portion of the lumens rated). The regular phillips alto achieves all those lumens purely in the longer wavelengths. It's not that human eyes are much less sensitive to this yellow/red light, but at least it's useful, and it's a $5 bulb, lol.
all imho