3 iPhone flash not up to snuff? The iBlazr’s four LEDs put out some serious brightness (it comes with a diffuser) with variable power, flash and continuous modes, and a 5600k temperature that mimics daylight. You can have the light on constantly, or a free companion app can control it. The iBlazr swivels in the headphone socket to add a degree of direction to its coverage, which is even but, even with the diffuser attached, fails to illuminate the corners of the image as brightly as the centre. iBlazr claims its battery is good for 500 flashes. Ian Evenden
Pocket-sized but powerful, iBlazr beats the iPhone’s flash and can be used off-camera for video, too.