Graham K.
RMA process is like pullng teeth
If the product upon receipt works -- great. If you should subsequently have problems -- what misery... No-one to call, slow responses via email -- you have to beg, charm, cajole to get an answer or turn-around, and forget getting your money back... What with similar bulbs available on Aliexpress, albeit from unknown suppliers, their price compared with Superlumination more than makes up for any possibility of uncertain returns to a direct supplier from China. Superlumination do not have their mojo and it shows...