Answer: Binary Secret #240

The secret message is:

MOTH

Row by row

Row	Bulbs	Add the ‘on’ numbers	Character
1	01001101	64 + 8 + 4 + 1 = 77	M
2	01001111	64 + 8 + 4 + 2 + 1 = 79	O
3	01010100	64 + 16 + 4 = 84	T
4	01001000	64 + 8 = 72	H

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 chr() turns the number into its character.

secret = [
    "01001101",
    "01001111",
    "01010100",
    "01001000",
]
message = ""
for code in secret:
    number = int(code, 2)
    message = message + chr(number)
print(message)

When you run it, it prints:

MOTH