Abstract: Among other disclosed subject matter, a lighting device cooled by being at least partially submerged is provided. The lighting device includes a housing forming a chamber having at least one transparent portion. The lighting device includes a diode in the chamber emitting light through the transparent portion. The lighting device includes a cooling conduit configured for a liquid to flow along the chamber when the lighting device is at least partially submerged in the liquid, without the liquid contacting the diode. The diode is mounted on a surface that abuts the cooling conduit.

Abstract: A concave light reflecting device for providing substantially uniform illumination across a plane comprising a parabolic reflecting surface, an involute reflecting surface, and a segmented reflecting surface. The parabolic reflecting surface having a first end and a second end, wherein the parabolic radius of the first end is less than the parabolic radius of the second end. The involute reflecting surface having a first end, a second end, and a focal point within the concave portion of the device. Wherein, the distance from the focal point to the involute reflecting surface increases from the first end to the second end. The second end of the involute reflecting surface transitions to the first end of the parabolic reflecting surface, and the first end of the involute reflecting surface is connected to the segmented reflecting surface. The segmented reflecting surface extends outward from the focal point of the involute reflecting surface for decreasing glare from the device.