The Titanium Haiku is a 1 x CR123 powered flashlight. The Light Engine is a "three speed" Buck/Boost converter driving a Cree XR-E LED (Q5WG bin). The three drive levels are approximately 25, 125 & 650 mA to the LED with typical out the front flux (lumens) of 4, 30 & 135 respectively.

The anatomy of the Haiku:

The McClickie battery pak used on the Haiku:

The Haiku drives the LED on high at sufficient power to generate heat of significance. I did a test using a FLIR camera:

I covered the light as well as a copper penny with masking tape of a known emmisivity. The Fluke temperature probe measures 27.4 degrees C, ambient. In the FLIR image below, you can see that the ambient sampling (covered penny) measures 28.2 C.

The flashlight measures 57.4 C at the hottest surface point. The light was left unattended for sufficient time to reach maximum operating temperature, under the conditions shown.

The McR-17XR reflector selected for the Haiku has an exit diameter small enough, relative to the opening in the head, to allow most of the light out of the front end. The window seal O-ring and then the window retaining O-ring and inside diameter of the head are such to allow the direct spill of light from the LED access to the outside and not be restricted or reflected off by virtue of contact. In the image below, you can see how the O-rings and lip of the head all step out in diameter and away from the exit angle of the reflector itself.

One sample was used to gage run times. A fresh SureFire CR123 cell was used for power. On the high level, the data below was collected in my integrating sphere:

On the medium level, the data below was collected:

On low level, the following data was collected:

For a beam comparison, I took photos of a Ti PD-S and the Haiku. Below, is a comparison matrix of all levels shot at the same manual setting on the camera. There was a moon above but the clouds diminished the ambient light for the most part to inconsequential. You can see the cloudy sky in each image and it attests to the same exposure in all images:

Below is a beam comparison of high output between the two lights:

Bead blasted version: