Quoted from foozle:I did read about non ghosting. Is there a way to tell if I need in advance on those games?
In my experience, most games have issues with ghosting, but usually it's only a few bulbs here and there. If you aren't price-conscious, then just go non-ghosting everywhere. That's what I do personally. And that's what we do in all our kits, except for a handful of games that we know don't have any issues.
The exception to all of this is early Bally & Stern solid states. Those games have a different issue, which I call strobing (ie: a bulb that should be lit solidly is actually flickering). For those, you need a hardware fix: either an Altek lamp driver board, our Bally/Stern flicker eliminator board (https://www.cometpinball.com/products/bally-stern-flicker-eliminator), or Yoppsicles. That page I just linked to lists all the games impacted by this. Again, non-ghosting bulbs won't help, you need one of the three solutions mentioned, and no special bulbs required.
Quoted from foozle:I’ve heard it depends on whether original boards are in the game or not, but not sure how to determine that.
This isn't true, unless you're referring to the specific case I cited above: an early solid state Bally or Stern, with an Altek Lamp Driver replacement board (which is a strobing issue, and not a ghosting issue anyway). The only other exception I can think of is pre-Spike modern Sterns. If you have installed an OCD board, then you specifically want standard bulbs.
Quoted from foozle:Also, are the non ghosting going to be on sale? Also, I only see 1smd non-ghosting on your website - do you not make 2smd non-ghosting?
Non-ghosting bulbs of any type aren't on sale. We only have non-ghosting in 1SMD, and 4SMD. But, the 1SMD non-ghosting bulbs are brighter than the standard 1SMD bulbs...and for that reason we don't make 2SMD non-ghosting. Yeah, it's confusing. 
Quoted from tbaum:Awesome! Thoughts on non-ghosting for Harlem? I was planning on just doing 2SMD frosted everywhere (I have the count as aprox 39 x #555 & 52 x #44).
Harlem is actually one of the games that needs a hardware fix that I just mentioned. Yoppsicles are great, but a lot of work (as you need to remove all the sockets from your game). This board takes a few minutes to install, is relatively inexpensive, and lets you use standard bulbs: https://www.cometpinball.com/products/bally-stern-flicker-eliminator
Quoted from Xtraball:Is there a way to determine what smd a bulb is just by looking at it when it’s in your hand? In other words, say I drop a few bulbs of different brightness’s, is the only thing I can do to see what each bulb is is to light it up?
It would be smart of us to label the bulbs...especially with retros now in the mix. The answer is: yeah, you have to plug them in and look. Sorry!