I always treat anything produced for TV with more than a modicum of salt, similar things have bee sown before on TV where the director/presenter said such and such but when the truth came out is was a shere lie. MTher are a number of British wrabow archers who got involved in another TV program which proported to show that the English Warbow could not penetrate plate, the archers later reported the problems with the program and stated they wished they had never got involved in the filming.
If the producer was genuine in his wish to demonstrate the effectiveness of the mongul bow over the English warbow he would have demonstrated it using armour material as used in the day he wished to compare. He would have said what weight each bow was, would have used the type of arrow used by each bow. Instead from your explanation he said the English bow was heavier than the horn bow, he appeared to be using the same arrow, he shot at a piece of brass, claiming that said brass was a fair representation of the armour used in the day.
Now to be able to say that the brass was a fair representation of the armour used can only be said after exhaustive penetration tests on both iron/steel armour and brass, but why bother to do such comparisons when the iron/steel armour is available and must have been available to perform the comparative tests.
English Warbows perform at their best when using relatively heavy arrows, wheras generally horn bows are used with much lighter arrows.
As there are no surviving examples of a Gengis Khan era Mongul bow any claim to know the weight of such is pure speculation, as I have said I have not heard of a current horse archer that can pull and control a 150lb bow while at the same time riding and controlling his horse. I doubt that there was a need for such in the day of the Khan, their armour was not that good. I have chosen to only talk of 160 lb as it is a weight that a lot of people seem to accept as a good weight for English Warbows, not the 180 to 200 lb that mathematical modelling determines as the weight of some of the Mary Rose bows.
We know the type of armour penetrated by the English weapon, when we see such armour penetrated by horse bows using the heads and type of arrow they used then we would be able to say that is a fair test and comparison.
As for what the bow is made of watch this, listen to the words, ignore what is written om the screen and look at what the bowyer is applying glue to, if you look carefully you will see a bamboo nodes.
http://www.youtube.com/watch?v=UgEp4ZAPbs0&feature=related.
Seeing as how both bows shot at the same material then as far as I'm concerned the test was valid.
All that the test proved is that at some undetermined weight for an English style bow, (was it warbow or ELB) a horn bow of a claimed lower weight could better penetrate a piece of brass with an arrow of undetermined weight.
Craig