Did ya read the whole thread, not once have I said HPS was bad, hell growers have been usin em for years, All I have said is it is not the best/right spectrum for plants which is very well known, nothing new. This thread is not about comparing lights, saying one is better than the other. This thread is how to properly use light to get more out of it. which most do not understand thanks to forum rhetoric that has been passed down for ages.
I did read a good portion of your Thread and I find it interesting, but inconclusive regarding Light. I just finished up a Sour Diesel under 2 150 Watt HPS lights, which are the only lights I have ever used in flowering. I use a Floro during the first part of veg, but switch over to HPS about halfway through that cycle.
The picture below is that plant, which grows through the roof if I don't top her. She is a Sativa, and the picture you see is showing her at over 5 feet tall, and that's after topping. This is also in a 2x4x8 closet, so my room is limited and I have to be careful when growing this Strain, otherwise it's nothing but a fight to keep her out of my lights.
I have grown this Strain 4 complete grows, so I've got a pretty good idea what I'm up against when she comes out of the ground. I keep a "Log" of every, single thing I do to bring my plants to a cured and finished product. Temps, Humidity, Nutes, Soil, exact days of Germination, Veg, Flower, Cut, Hang, Cure, you name it, I pretty much keep a record so I can compare my results.
This Sour Diesel is the most potent Strain I grow. The Trichomes are so dense and plentiful, you can smoke the Shake and get flat, stoned! I also get the most from this Lady! After the hang and initial cure of over 3 weeks, I had 11 full Kerr jars of finished bud, and 2 jars of dank shake (13 total). That doesn't include the potent shake that my wife has used to make oil for edibles. This from just one plant in this little closet.
I also have had this problem with this plant; the bud towers growing too damn high, and into the lights. You can see in this picture, where I use ribbon to pull them away from the light, and they literally grow up and past the light! That's how close they get! Even at this level, the buds remain EPIC and healthy!