What Light transmittance/VLT for glazing

[SBMS]

We are looking at triple glazing options. Front of house has a fair amount of south facing glazing and there is a glass option that has a g value of 0.43 (43% solar energy let through) and lets 63% of light through (VLT). We will likely go for this for the front elevation. 
 

At the moment there is little cost difference to doing the rear as well. The alternative is a triple glazing with 0.61 g value (61% solar energy let through) and lets 73% of light through. This is a 0.6 Ug value whereas the other glazing is 0.5Ug. 
 

Will a 63% VLT be noticeably darker?