Ok, thanks for the advice

Mine are 8 weeks old(still veg), the problem is I've got roughly an inch between nodes, sometimes even half an inch. Yours look like 3-4 inches between them.
I've got 2 different strains, so I suspect it's something I have done. Got 16" between plants and 400W bulb, some say it's too far away but my plants are still very bushy. See my thread if you wanna see the pics.