lifting heavy vs light weigh???

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Research doctors working for applied physiology determined that heavy and light loads were equally effective at inducing muscle growth and promoting strength provided it is lifted to the point where it is difficult to maintain good form.
Resistance exercise load does not determine training-mediated hypertrophic gains in young men

agree with you. as I age, I'm learning that there are other options than to go "as heavy as possible". More importantly, imho, is to go slow with your rep, get the FULL contraction, hold for a fraction of a second, and to slowly return to the starting point. Then, do this with as much weight as you can, while still maintaining good form, for three sets of 5/10/15 reps or whatever works best with your body.

Once I started doing this, I began to use a lot less weight, and with less weight, the risk of injury decreases as well.

this is what I do