vray light multiplyer vs. watts

hi all
i was wondering if someone could shed some light (lol) on this,
i need to use these fixtures by ERCO (TM Spotlight
with transadapter for low-voltage halogen lamps - 50 W)
now i ve got the ies, but i wanted to replace those by vray lights, wich multiplier should i use to get a correct light intensity?

thanks,

Hi ene.xis,

Vlado did a thead on something like this a while back. I don’t know if it will help but…
http://www.chaosgroup.com/forum/phpBB2/viewtopic.php?t=9157&highlight=watts

Dan

Thanks Dan,
yeah i remember that thred, just re-read it …even if i think i got it…i m still not 100% sure…
i do like when vlado comes in an clean those threads with examples…bump
hehehe…
anyways i made a few tests and i ditched th vray lights and am now using the ies bundeled with th erco model… :?