Answer: Binary Secret #135

The secret message is:

GRAPE

Row by row

Row	Bulbs	Add the ‘on’ numbers	Character
1	00111	4 + 2 + 1 = 7	G
2	10010	16 + 2 = 18	R
3	00001	1 = 1	A
4	10000	16 = 16	P
5	00101	4 + 1 = 5	E

Crack it with Python

Python can do the adding for you. int(code, 2) reads a string of 1s and 0s as a binary number. Then the program finds that letter in the alphabet. It takes away 1 because Python counts the letters from 0.

secret = [
    "00111",
    "10010",
    "00001",
    "10000",
    "00101",
]
letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
message = ""
for code in secret:
    number = int(code, 2)
    message = message + letters[number - 1]
print(message)

When you run it, it prints:

GRAPE