Quoted from Lermods:Welcome to the wonderful world of spike where the simple act of changing a bulb is no longer simple. You cannot put any bulb in there. I would contact stern tech support and ask them what to use.
This is good advice. With SPIKE you can cause damage or problem with the node boards, especially if you try to install an incandescent.
I would make changes with caution. The SPIKE system does not have fuses, if you create an issue the board may shut down.