I've changed the value of the select list to:
<option value="<?php echo $row_rsDIMM['LEDprodoptionsID']; ?>"><?php echo $row_rsDIMM['LEDvarname']?> + £<?php echo $row_rsDIMM['LEDprodoptionincr']; ?> </option>
However, now that this seems to work it's passing the numeric value to our cart page so, in the list of variables in the customers cart, they're seeing "50" instead of "Dimable".
We also want to store the word "Dimmable" in the order detail table so that we can easily identify it.
How do we achieve that?