Answer: Binary Secret #313

The secret message is:

LET'S PLAY

Row by row

Row	Bulbs	Add the ‘on’ numbers	Character
1	01001100	64 + 8 + 4 = 76	L
2	01000101	64 + 4 + 1 = 69	E
3	01010100	64 + 16 + 4 = 84	T
4	00100111	32 + 4 + 2 + 1 = 39	'
5	01010011	64 + 16 + 2 + 1 = 83	S
6	00100000	32 = 32	a space
7	01010000	64 + 16 = 80	P
8	01001100	64 + 8 + 4 = 76	L
9	01000001	64 + 1 = 65	A
10	01011001	64 + 16 + 8 + 1 = 89	Y

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 = [
    "01001100",
    "01000101",
    "01010100",
    "00100111",
    "01010011",
    "00100000",
    "01010000",
    "01001100",
    "01000001",
    "01011001",
]
message = ""
for code in secret:
    number = int(code, 2)
    message = message + chr(number)
print(message)

When you run it, it prints:

LET'S PLAY