Concrete 3 Watt LED Light w/ Walnut & Balloons!

Using a 3 watt led, concrete and balloons I made an artistic-looking desk light you can recharge. Check Out VideoBlocks 7 Day Free ...

Off Camera Flash - Guide Numbers and Watt Seconds- Strobist Photography Tutorial #3

In this Part 2 of the Speedlights vs. Monolights battle, we are going to compare Guide Number and Watt Seconds as a way of rating ...