Answer: Binary Secret #391

The secret message is:

Yay friend

Row by row

Row	Bulbs	Add the ‘on’ numbers	Character
1	01011001	64 + 16 + 8 + 1 = 89	Y
2	01100001	64 + 32 + 1 = 97	a
3	01111001	64 + 32 + 16 + 8 + 1 = 121	y
4	00100000	32 = 32	a space
5	01100110	64 + 32 + 4 + 2 = 102	f
6	01110010	64 + 32 + 16 + 2 = 114	r
7	01101001	64 + 32 + 8 + 1 = 105	i
8	01100101	64 + 32 + 4 + 1 = 101	e
9	01101110	64 + 32 + 8 + 4 + 2 = 110	n
10	01100100	64 + 32 + 4 = 100	d

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 = [
    "01011001",
    "01100001",
    "01111001",
    "00100000",
    "01100110",
    "01110010",
    "01101001",
    "01100101",
    "01101110",
    "01100100",
]
message = ""
for code in secret:
    number = int(code, 2)
    message = message + chr(number)
print(message)

When you run it, it prints:

Yay friend