Unlike a redstone lamp, copper lamps will not power adjacant redstone components if it is directly powered. See screenshot for more example.
IS THIS AN ISSUE?
As I am not a professional redstoneer, I cannot say if there are use cases for this, but I beleive that there are more use cases if it acts more like a redstone lamp. Since you could have a t-flip-flop that extends 1 more block, you could reach it deeper into redstone contraptions.
Linked issues
is duplicated by 5
MC-266065
Copper bulb act like a tranperment block, while redstone lamp doesn't
Resolved
MC-266922
Repeaters dont act like they should
Resolved
MC-268693
Copper bulbs don't power adjacent lights
Resolved
MC-273669
Redstone that goes down the side of copper bulb is not preserving its power level.
Resolved
MC-277012
Copper Bulbs Not Getting Hard Powered
Resolved
relates to 2
Attachments
Comments 3
Also, they are called "copper bulbs" rather than lamps
From the changelog on Copper Bulbs:
Does not conduct redstone power
Can confirm. Also relates to these tickets: MC-266054 and MC-266090