I get big dense buds under my t5 even denser than my 1000 watt. Thats due to IR. You keep changing bulbs with out doing a full run with just one set up. only change bulbs once every batch (2-3 months). Not every few days. Otherwise you can't judge which bulbs did what. Experimenting takes time just like breeding strains. That takes 2 years minimum to back cross 2 strains.
I know you think that you are right about IR, but I am starting to doubt you. Notice how there is NO IR < 800nm in the Hortilux HPS, yet it has been said here a number of times that HPS has all this IR in it which causes the stretch. The IR that comes from HPS is pure heat. That's what IR is anyway.
Now you are saying it causes bud density, which just can't be true. IR is pretty much just heat. Now, if you are actually talking about the 730nm wavelength which does the Pf>Pfr conversion, that is actually considered "far-red" NOT IR. So, yes, 730nm light MAY be one of the causes for bud density, but do take note that there is ABSOLUTELY ZERO 730nm in an HPS spectrum, yet HPS lamps are known for creating dense buds. Far-Red and IR are not the same thing. Any wavelength past 730nm has very very little effect on flowering, ESPECIALLY IR.
You also tried to blame me for posting false SPD's awhile ago which you never fessed up to the public that you were wrong. I forgive you for that, but c'mon, let's get the facts straight here.
I didn't invest in a $2000 SPD maker for nothing. I really wanted to get all this b.s. cleared up so that we could actually come up with REAL FACTS about spectrum, T5's, wavelength, etc.
I now know that the stretch is due to the extreme red/blue ratio in the HPS. It's like 20:1 Red to Blue in a HPS. It's either that or it's due to the abundance of yellow wavelength.