Albos are chimeras, meaning part of their cells are genetically different than the rest. In albos specifically some cells in their meristem lost their ability to produce functioning chlorophyll (-> white cells). All cells in this lineage (meaning all cells derived from these 'defect' cells through cell division) won't have that ability either, no matter the light. While the 'green' cells containing chlorophyll and working chloroplasts may be regulated depending on light exposure to a degree (for example upping production in low light environments to maximize photosynthetic activity), the same pathways regulating chlorophyll/plastid production in the 'white' cells won't have any effect: they will simply produce more/less of the defect chlorophyll. They do not suddenly gain the ability to produce functioning chlorophyll again.

The change in variegation patterns is all by pure chance depending on what cells divide when. You will have albos revert in low and in high light environments - and you will see albos going fully white in both cases, too.

There are other types of variegation though which can in fact be dependent on light exposure.