Please delete your replies in the other threads, (apart from being annoying) asking the same question over and over confuses people, it won't increase the chances of getting help.
Yes you do need the ratings for the solar pannels, if they're not generating enough current then the LED will be to dim for you to see.
What's the volt drop of the LED? Are you sure you're connecting it the right way round.
Also may I ask why? There's no point in connecting an LED to a solar pannel.