Are these bulbs the same size?

[porpoiseaquatics]

I'm wondering if a 150 DE MH is the same size as a 250 DE MH? I'm thinking about hanging a 150 over my nano and I have a spare 250 DE reflector. I guess at worst case, I can just swap out the holder.

 

[enderg60]

nope different size and connection type. You can use the reflector but you will have to swap the socket.