[quote author=Jim_Chow link=board=2;threadid=6257;start=msg51346#msg51346 date=1066259906]
...you'll see that not only does a 40 yr old need twice the light as a 20 yr old, but a 50 yr old needs twice the light as a 40 yr old and a 60 yr old needs five times the light as a 40-yr old! In other words, a 50yr old needs FOUR times more light to see the same object ...[/quote]
If my math is correct, doesn't a 60yo need 10X the light as a 20yo? i.e., 20 - 40 = 2X and 40 - 60 = 5X = 10X? Based on this, a 60yo that used to use 80W high beams now needs 800W high beams
Cheers, Hugh
...you'll see that not only does a 40 yr old need twice the light as a 20 yr old, but a 50 yr old needs twice the light as a 40 yr old and a 60 yr old needs five times the light as a 40-yr old! In other words, a 50yr old needs FOUR times more light to see the same object ...[/quote]
If my math is correct, doesn't a 60yo need 10X the light as a 20yo? i.e., 20 - 40 = 2X and 40 - 60 = 5X = 10X? Based on this, a 60yo that used to use 80W high beams now needs 800W high beams
Cheers, Hugh