I got mine from a Chinese superstore in Tagbilaran called Unitop.. Not sure if there is one like it in Cebu but the chances are there must be and the bulbs will be available there somewhere.. An Aussie mate cleaned out the shelf one day out and bought 50 bulbs...They even come with remote control so when the brown out hits you switch them all on remotely..We are in Manila for Christmas so I cant tell you the brand name till I get back in the new year..
I also highly recommend the LED standing emergency lights...These come on automatically in a power cut...Cost pennies to run and rechargeable via mains.