These "fake weights" may be lighter than they claim but you gotta realize that some photo sessions run on for hours (four to eight is typical) and those light weights get pretty damn heavy by the middle of the shoot.
I don't think that they were first made in an effort to deceive anyone, but more than likely - just to make it easier to get through a long term photo session.
Those "Hollywood" weight sets were made to look weak actors look much stronger than they actually were, but also to make it much easier to work with on the set where everything is fake anyway. I worked on a Merlin/Sir Galahad type movie and the set (Castle) was spectacular and looked more real than reality, but when I leaned up against that "insurmountable wall" - it fell over (actually just "out of place") and ruined that take for 40 minutes. And that's a lot of lost time on a major film costing many thousands per on-set hour.
So anything that makes it easier or speeds up the process - saves time and money in the long run.
Same goes for those artificial weights used in photo sessions.
Well...thats all well and good, but the problem is that the magazines try pushing the fake weights as superhero acts of legit strentgh by the bodybuilders that they pimp. For example, I remember one photo shoot that was going on at Gold's... MuscleMag was shooting Peter Putnam, (who by the way is a great guy, who I have nothing bad to say about), and he was rowing a "200 Pound" dumbell. A couple of months later he shows up in a musclemag article, quoted as saying, "I normally only row about 150, but for the photo shoot this day I was feeling extra strong and decided to push myself for the cameras and row 200!" (Paraphrase on my part).
That same 200pound dumbell only weighed about..30-40 pounds tops. And this isn't even the worst example... there are many obscene flex articles, in which absurd poundage claims are printed with the supposed photogenic "proof" accompanying them. To be fair this has lessend somewhat in recent times with the new change of direction in Flex, but you still see this kind of nonsense in the industry as a whole.
Point being is: Its all a lie! We don't like being lied to. Time for some transperency in this subculture/industry.
M!