Well take a look at what what types of bulbs you need, is it a mix of 44s & 555s?
Take that info and go to Comet, and go to the bulk section and order warm white 50 or 100 packs. Then you don't have to sit around and try to make a list of what colors where blah blah (although you might have to get a few specific if it has exposed colored bulbs above ramps or something g like that).
Never buy a kit.
Don't know how much fading there is in BTTF so don't know if an OCD LED is needed.

https://www.cometpinball.com/products/2smd-bulbs-100-packs

Does anyone know if BTTF has ghosting issues?

Right check my link above. The " sizes" are just power of the leds, the ones 8 linked above I'm going to tell you are the best and used in the most applications; frosted domes. That just means the type of lens or cover goes over the Led.
Sure there are all special types of bulbs for all types of.... Zzzzzzzz..... Don't get pulled into marketing shit, these leds work in 99% of applications perfectly.

Ocd led is an add on that helps leds look like incandescents. It's not something you need for most machines.

If you're new to pinball it's best to learn right now how to do shit for yourself; cause that's the life.

Hahaha this guy is hilarious.

Personally I would say NOT to use LEDs in your flashers...those are the bigger bayonet bulbs and their number is 89. Their more expensive, canbe overly bright, and I am assuming since it's a Data East you have a ton of them.

This is probably also a good time (?) to bring up there are 2 types of sockets/lighting; GI & Inserts/controlled.
The General Illumination lights the game up and they are all connected, always on or off.
The inserts/controlled are all the other lights that go on and off depending on what is happening in the game.

I bring this up because it may not be so easy to swap on the GI. Data East could have stapled down socket for GI and not easy to chnage form the underside of the playfield, meaning you might (will) have to take some fo the shit n the top off to change them.
That's my recollection, but I haven't hopped a BTTF in like a year.

Well you can get dumb colored GI and spend more monies for it...I think that's what we are calling wrong.

Oh boy.

I think OCD LED specifically calls for non ghosting bulbs?

Ah I see...just more flexibility

"What if I already have non-ghosting bulbs?
Standard LEDs will give the OCD board more direct control over the LEDs, but you can still use non-ghosting bulbs with some minor restrictions."