I'm a collector of Gottlieb EM's (I have 6). I've always been a fan of trying to keep it as original as possible. In restoring my games I like to buy new posts, roll through guides, pop bumpers with skirts and if drop targets are worn really bad, I'll replace those too. In my restoring process, I always clean the light sockets and replace the bulbs with new 47 bulbs, until now. I decided to try LED's in my Atlantis and love how it came out. LED's in the backglass brings out so much of the color and detail. As for the playfield, I would replace the bulbs in the top only. The bulbs underneath the playfield I would leave as 47 bulbs. Specials and pop bumpers I will put color LED's in. Ive been using the super bright, frosted LED's from Nifty LED. I know some people have problems with the ghosting, but I havent noticed anything .
Anyways, this is just my opinion and likes. Im curious to hear what the rest of you collectors think.

Im torn too. I like them both ways. Maybe its just a phase for and I'll go back to 47 bulb. However evertime I look at my Atlantis and Jacks Open backglass, it makes me smile at how good they look.

Agree 100%

Ahhhh good idea. Never thought of that.