led diy cxb3070 cxb3590 vero 29 v2

anyone using the citizen? specifically this one http://ce.citizen.co.jp/lighting_led/dl_data/datasheet/en/COB_5/CLU058-1825C4_P3372_1115.pdf or any from version 5 http://ce.citizen.co.jp/productse/info.php?no=107 it looks like they get really high L/W at a high drive current

hello again :) first of all.. i would like to go with the CXB 3590 but they are really expensive for people who have not huge amounts of money next to them like myself - im a mother so basicly i have no money at all could pay that over time of course but i didnt saw a shop with cobs who gave...