WP Lightbox 2 force popup size

My site is https://www.ignitionmetalartdesign.com/my-work

I am just starting to to upload about 2500 images so I am laying out my protocal in the interest of fast load times

99.999% of the images I will be up loading will be my standard 100px high and auto width. I locally prep them with progressive compression and resize using a couple of steps. This size image is kind of useless in a lightbox pop up though. So my options are to upload two different sized images, or upload a larger version, the resize it in the medial library to 100px high

So, I am thinking that if I could force the light box popup to a minimum or even a static height of around 250px or so, then maybe the 100px high image in the library could just expand. There may be a loss of clarity, hopefully not too much Just trying be the most efficient I can with uploadin MBs and time required to manually resize images

Any ideas? I am not stuck on using any particular lightbox but I do really like WP Lightbox 2

Thanks
Marty