The item is reliable and compact but the amount of reflection is limited in the sense that the mouth of the reflector is quite small. Even using a 100 watt 6500k light bulb the amount of reflected light is not really that great. The clamp has a pivoting mechanism so the clamped is stationary but you can still move it around. i have found this feature to be quite loose and does not stay in place like in the picture. No matter how tight you fasten it it always limps and doesn't stay in place. But it is a low price item so....
I purchased two of these in the hopes to use them to help bring additional light into a photo studio that I had made. The clamp itself attaches to the lamp using a swivel (bevel?) style, that lacks in turning radius and function. Also the clamp requires a lot of pressure to open and doesn't open very wide (about 2" or so), if you need to clamp this onto something thick (or need to be able to swivel the lamp fully, without dis-assembling it), this item is NOT for you.
Depending on the brand of CFL, the base of the CFL may be large enough to prevent the bulb from screwing all the way into the socket (base hits the sides of the reflector before the bulb is seated). For higher wattage CFLs, 45 watts and up (that's actual CFL wattage, not equivalent) a socket extender will work, but it effectively adds about 1.5" to the length of the bulb. The tip of my 45 watt CFL extended below the rim the reflector, which makes it very easy to break if you're not careful. I'm not implying a defect in the reflector, rather just an giving an FYI in case you're planning on using a high wattage CFL. The socket in the reflector is a standard E26 btw and the reflector works ok.
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