So long as there was sufficient light as Ike describes above, you're good to go.
One more tip, as thus test is very subjective, many of us also like to advise the 1st time cya testers to repeat the test several times. This can be done with the same solution of reagent and pool water without effecting the results. Simply squirt it into the tube after you have followed the instructions for mixing, then resting, then a final mix and when you're ready to test again, just suck it back up into the squeeze bottle, you'll get most of it out of the graduated tube this way, then pour the rest back into the squeeze bottle. Cap it, then turn it end over end a few times, no need to violently shake, then try again, squirting it back into the test tube again.
Do this as many times as you feel you need to in order to get consistent results and feel confident with the test.