Answer: Binary Secret #300

The secret message is:

WELL DONE

Row by row

Row	Bulbs	Add the ‘on’ numbers	Character
1	01010111	64 + 16 + 4 + 2 + 1 = 87	W
2	01000101	64 + 4 + 1 = 69	E
3	01001100	64 + 8 + 4 = 76	L
4	01001100	64 + 8 + 4 = 76	L
5	00100000	32 = 32	a space
6	01000100	64 + 4 = 68	D
7	01001111	64 + 8 + 4 + 2 + 1 = 79	O
8	01001110	64 + 8 + 4 + 2 = 78	N
9	01000101	64 + 4 + 1 = 69	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 chr() turns the number into its character.

secret = [
    "01010111",
    "01000101",
    "01001100",
    "01001100",
    "00100000",
    "01000100",
    "01001111",
    "01001110",
    "01000101",
]
message = ""
for code in secret:
    number = int(code, 2)
    message = message + chr(number)
print(message)

When you run it, it prints:

WELL DONE