They are HUGE. The old CFL's are in the middle, absolutely dwarfed by the new lights. I got them for my closet where I veg. I had 2 x 24inch, 24 watt CFL tubes that just weren't quite enough light. I bought 4 of these lights and laughed out loud when I took them out of the box, they are not quite as big as a 2 liter bottle, but they are close. Honestly, I think 4 of these will be too much light.

I might use one or two of these in my Brute bucket during veg but they may be overkill. I wanted to share because it cracked me up how big these were.

Hereis the link to the lights I bought.