The present invention relates to a hydraulic type tensioner with a relief valve. More particularly, the present disclosure relates to LED elements and lamps comprising wavelength attenuating elements comprising REE compounds having at least a portion of non-crystalline, non-hydrate form, methods of preparing such elements, and LED elements, LED arrays, LED packages, optical elements, lamps and systems made with same. A hermetic plate is subsequently bonded to the MEMS substrate stack and disposed over the formed MEMS device layer to at least partially form a hermetically encapsulated cavity surrounding the MEMS device layer. A rotation guide extends radially outwardly from each hinge hole. The basket includes a front portion and a rear portion with the rear portion of the basket connected to the base via the pair of masts to support the front portion of the basket in a vertically spaced relationship over the base adjacent the front portion of the cart.