The Gamer Guy wrote:
They can prevent props from being moved/edited too if the light is placed on one. Lights are pretty fucked up right now, but to fix your issue you can open your context menu by holding c, right clicking the light, pressing edit properties then altering the brightness/radius or just turn it off in the same menu.
being able to remove them would be so much easier, not sure If it's possible after reading he other replies.
Let's wait for an official answer though