The phrase "a reflection of lack" is correct and usable in written English.
It can be used to describe a situation or condition that indicates a deficiency or absence of something.
Example: "The poor performance of the team is a reflection of lack in leadership and guidance."
Alternatives: "an indication of deficiency" or "a sign of absence".
"This is not a reflection of lack of confidence that the Total Return fund will outperform the market but a reflection of the fact that the bond market is on its heels," Mr. Gross said.
The disappointing auction was less a reflection of lack of interest in Iraq's energy sector than of the tough terms demanded by the government, the location of some of the fields in dangerous and remote regions of the country, and the fact that many of the blocks up for bid were for natural gas, which is less attractive to foreign companies than oil.
The lack of reading skills at the college level is a reflection of lack of skill from down the pipeline.
However, this may be a reflection of lack of knowledge.
It is possible that some of the perceived technological barriers to utilizing such a system may be more a reflection of lack of familiarity with novel communication strategies.
Poor knowledge of autism spectrum disorders among physicians and failure to give further information to caregivers may be a reflection of lack of training in the wide range of behaviours that occur across the autism spectrum.
However, this is a reflection of the lack of standardisation, lack of templates and lack of knowledge of 'landing sites' for UC in the UUT.
Sheryl Sandberg, the C.O.O. of Facebook, has authored a new book arguing that women's lack of success in business is a reflection of their lack of commitment, thereby sparking widespread debate.
I hope that the apparent lack of demand for data up to this point has been a reflection of the lack of awareness of the possibility of collecting useful data, or the difficulty of collecting it, rather than genuine lack of demand.
"The final act will probably be a reflection of a lack of ambition, of a willingness to punch below its weight and of a kind of lack of confidence that has been a feature of European politics for a couple of years".
Lack of data on specific aspects of child wellbeing could also be a reflection of a lack of concern.
