Hi. I have a Phoenix.
I found std 44 bulbs all round better for this era. 47 are not bright enough.
Same for GI and inserts and backbox.
The brand new 44 candescents make the game come alive and stay true to the original look and feel of the 1978 Phoenix. I only use Leds in DMD machines.

If you use Leds in a Phoenix it changes the entire look to a 90,s game, not a orig 78 game.
Once you see the game original, when u convert to Leds, u can't get the orig look out of your head and it plays on your mind. Lol
If your backglass is in great condition, and the game is only on for a few hours every now and then, go to 44 for brighten things up. If you leave the game on a lot for very long periods, then use cool white LEDs in the backbox.  I buy all my Leds from Tery at Pinball Life in USA at min of 100 a time in same type n colour and the discounts and savings are huge. Don't buy kits from anyone cause they are a rip off.

Can't take pics of Phoenix cause it's behind other pins and it's not accessible at moment.
If you do go to LEDs and want a much more modern look and want to play, buy a sample kit from Pinball Life or whoever and use different colours in 555 and 44 style colours and have a play. U can change insert colours from White to a colour or leave white, same for GI and backbox.

Have some fun with it. Try all 44 bright candescents and if u feel u want more, then go to LEDs and experiment with cool white for white, then single Led type Leds for inserts and GI. Do not go for super bright or anything over single Led style cause it's massive overkill.
See how you go.