A ventilated Ray Optics box which is open fronted with extended sides finned externally for heat dissipation and vertical internal grooves to accommodate a slit plate and cylindrical lens.The ray box includes:1 x 12V 21W lamp with one meter of twin flex ending in 4mm connectors A slit plate with single and triple slit whitened on one side black matt on the other.Collimating LensThe ray box operates on a 12V power supply (B8G85458) which is not included.45mm width: not suitable for use with 50mm filters.Replacement bulb is available to purchase separately (B8A56820).