Then expecting it to be accurately focused and reliable despite the fact that it would be hot sometimes and cool at others. Gases expand and contract with temperature, and if they cannot do this due to a fixed volume then the pressure increases and decreases.

The objectives were and remain at odds with the physics. How many ingrounds have you seen with water inside, or at least condensation?

Thus far the inground market had not been attractive to Illumination Physics.

To be fair to the first generation of high end ingrounds, they came out of the factory with the seals well assembled. However, that precision often did not survive the first lamp change in the field. The seals are also compromised if the fixture needs to be opened for aiming.

The advent of LED ingrounds was a leap forward of sorts because the consumable light source was eliminated. In theory it was no longer necessary to open the fixture to replace a lamp. Aiming became the remaining issue.

Now the timing for illumination Physics was perfect and we have created a new family of aimable inground or recessed fixtures.

Within the inground kit we have included a stainless steel gimbaled IP68 luminaire that is completely potted with silicon, so there is no airspace inside - It cannot allow ingress of gas or water. The luminaire resides within the waterproof drum and face plate enclosure for the burial model rated at IP67.