The Ikelite RCD for its brightest bright spot, fairly even illumination and user-friendly case latch. Maximum intensity indicates the brightness of the center of the illuminated area. Physically smallest of the four, the UK400 sacrifices some maximum intensity to gain a smooth, even bright spot with gradually feathered edges, making it the best floodlight of the four. As a result, what you see on the reef is actually there, not painted on it by irregular illumination. The pre-production sample we tested gave a smooth, even beam pattern almost identical to that of the UK 400, though with slightly less maximum intensity.
Maximum intensity indicates the brightness of the center of the illuminated area.
One of the best features of the Pelican light is its dual-filament bulb. All these lights overdrive their bulbs in search of an intense beam, but the price is a short bulb life - typically the bulb burns out on your second or third set of batteries. The price of this redundancy is an oddly shaped beam, because the unused filament casts a shadow. The bright spot is about the same size as that of the other lights, and considerably less bright than either the RCD or UK400. Miss - Less intensity.