So where is that cold light project?

So lets see... a little over a year since I got the Beseler 45 enlarger and the hope was to create a cold light head for it.  It was to use a shutter rather than a on/off switch to keep the bulbs fully warmed and bright.  A nest of over 12 small cathode bulbs hold by standard Edison thread mounts screwed to a custom reflector plate and it would have had a sort of condenser and a 4x5 diffusion core.  The shutter was a simple reflex mirror or shutter blade much like that of leaf shutters... You know I think I'm beginning to remember why I didn't build this right away. 

New technology might mean I should think in the direction of LED lamps instead... I tested this idea in small scale soon after getting my enlarger and popped every one of the test bulbs.  So now the available LED spots available might be a better chance.  Hmmm....