Not too bad of a write-up, and instead of “buying” a lamp, maybe we could “reuse” an old lamp. Only other downside is the total cost for this could be around $50-80 dollars….given this solution is mroe robust than som ones I have seen that you could buy for the same amount. Or you can buy it from the author at $125…
http://www.instructables.com/id/Make-a-Solar-Powered-Led-Lamp-Post-Light