I was thinking.. it's not possible to use esram with classic deferred rendering engines, but more modern tile-based deferred engines can do the magic, it uses screen tiles to group lights, with a tight tile frusta to cull non-intersecting lights (reducing the number of lights to consider)
am I right?
this was discussed byt Lauritzen at the siggraph 2010
it's possible to tile in a fast 32 MB?
Something like Talisman?