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DLP230NP: Heat loss calculation about Q_illumination

Part Number: DLP230NP

Hi Experts,

DLP230NP .23 1080P DMD datasheet (Rev. C) (ti.com)

The above link is the datasheet. On the page 24,

"The conversion constant CL2W is based on the DMD micromirror array characteristics. It assumes a spectral efficiency of 300 lm/W for the projected light and illumination distribution of 83.7% on the DMD active array, and 16.3% on the DMD array border and window aperture. The conversion constant is calculated to be 0.00266 W/lm."
 
Questions:
(1)  0.00266 is got from 1/300*83.7%?
(2)  based on above calculation method, all the light on DMD is absorbed and turn into heat? is it possible?
Thank you and best regards,
Gerald