under bright lightunder intense lightin bright lightin the brightness都有“在强光下”是的意思。against 不是适当的介词,虽然在某些语境里或可用。如against the brightness he was still able to go forward在强光下他仍旧能够向前走(其实这句子 “面对强光 ”比 “在强光下” 是较好的翻译。)
in strong light