Its quite bright depending on the amount of solar energy provided!
This is not my best instructable to be honest, The way to get power can be subsituted.
Step 1: Materials
What led color do you want - I chose red. as long as the led has a positive and a negative wire out the end, it works.
Solar, or battery power - I chose solar just to test it. If you can find a good battery pack that packs enough volts without breaking the LED and has a positive and negative wire, You're safe.
Once you faced these questions, you can get these parts, and start building