Joules measure total energy delivered as the product of power (in watts) and time (in seconds): one joule equals one watt multiplied by one second. This metric is critical because photon absorption into tissue requires time.
factualpending
Evidence Quote
“we measure this with joules joules is the total energy of power or watts and time in seconds so one joule equals one watt times one second... it takes time for all those photons to be absorbed into our bodies”
Created: 8/13/2026, 7:47:20 AM
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