Which has more luminous efficiency |
|||
a) |
A 40 bulb |
b) |
A 40 fluorescent tube |
c) |
Both have same |
d) |
Cannot say |
Which has more luminous efficiency |
|||
a) |
A 40 bulb |
b) |
A 40 fluorescent tube |
c) |
Both have same |
d) |
Cannot say |