Subject: How can I convert between lux,lumen,candela,candlepower, B.P. candlepower

I am trying to make a comparison of lighting abilities of 
flashlights.  One claims 30,000 B.P. candlepower at 10 ft.  One other 
claims an output of 70 Lumens, another claims 15,000 candlepower.  I 
am told that the level of light can be measured in Candela, but a 
document I have mentions 50-100 Lux as a good amount of light in a 
corridor.   I am getting progressively more confused as I look more 
into this.   Your assistance would be greatly appreciated.

Re: How can I convert between lux,lumen,candela,candlepower, B.P. candlepower