I was "West," that is, the opening leader. My left and right hand opponents had alternated diamond and spade bids, neither supporting the other, suggesting something like 6-1 misfits in both suits (which actually turned out to be the case), and South bought the contract at four spades.
I held something like:
♠xx ♥Qxx ♦JTxx ♣Qxxx
led a low heart (the unbid major). This gave the opponents a free finesse, and the contract was (barely) made.
I had also given consideration to a diamond lead from the JT sequence. Since South had only one diamond, he couldn't finesse out the T or capture it when guarded by xx, after capturing the J with a higher honor. With honors in all three plain suits, I even thought of (and rejected) the "safe" lead of a low trump. The last alternative was to lead the fourth club, which at least left TWO guards for the queen.
Did I make a bad lead? Should I have led either a diamond or spade, instead, even though both had been bid by the opponents?