Can you use them in tandem with the led face light thing?
You use retin-A (branded as retirides, retino, differin etc) only at night. It must be washed off AM (will be mostly absorbed but leaves a bit of residue in upper layer of skin) and when skin is perfectly clean then you can use red light therapy (with vitamin c or copper peptide serum pre-applied and allowed to sink in if you like). For all the time you are exposed to daylight including winter UK daylight and ideally in-house daylight too, you should wear sunscreen with high level UVA protection.
The most effective form of vitamin A for skin rejuvenation is retinoic acid (the active ingredient in retin-A) and it is these products that as only available on script in UK (but OTC in Spain, India, Canada, Thailand etc).
Retinol, retinyl-acetate active ingredients are related but less strong forms of the same active ingredient (which is why they are not script products in UK) BUT many people get very good results with them anyway and prefer the "weaker" variant because it's less irritating too.
Of the retin-A products available, gel is the most irritating and microencapsulated cream (=slow release) is the least irritating format. Always start at 0.025% strength before progressing, use once every 3 nights only on dry clean skin etc before working up. For anti-aging purposes there is almost no difference in performance of 0.05% to 0.1% strengths.
I've been on retin-A for many years and stick to 0.05% a couple of times per week max.