OK, I know it’s not very BSAC-compliant, her not checking her own kit, but it keeps my marriage together.
She is also not very inclined to waste valuable fun time reading instruction manuals. She expects to jump into the water and for everything to work – perfectly. That’s why I don’t give her an underwater camera to take. I’m quite capable of flooding my own, thanks.
When it came to packing a lamp, an essential item of kit for a trip to the northern Egyptian Red Sea, I chose the IST T-100 for her.
It has a 2.5hr burntime from one set of six AA batteries, and I guess two night dives might be her ration for the week.
The lamp has a simple on/off switch, so no instructions are needed. She wouldn’t have the hassle of forgetting to recharge it and having to break it open, either.

Construction
A simple anodised aluminium tube around 13.5cm long and 7cm in diameter is threaded so that the lamp-head and battery-chassis can be inserted and screwed home at one end, levering it closed by means of the fixed handle.
The business end has a fixed but revolving front glass set behind a bezel. The whole weighs just over half a kilo. It is supplied in a rugged zipped pouch that protects it well when packed for travelling.

Light Source
Three high-powered LEDs are set in a group behind the front glass.
Unusually, there is the option to replace the individual lamp reflectors with diffused ones, so that it provides an even light source suitable for use with a video camera. IST calls these the “photographic lenses”.
Otherwise, the beam produced is an exceptionally narrow spot.
Always ready to think outside the box, I replaced two of these three reflectors with the diffused option, so that Mrs B had both a narrow spot beam to penetrate the water and a wide peripheral beam so that she didn’t crash into objects she hadn’t noticed – while inside the holds of the Thistlegorm, for instance (she’ll kill me when she reads this!).

Power Source
Six AA-size batteries set me back a bit, but they promise to last for more than 150 minutes of continuous use. I had to disassemble the lamp to insert them in its internal chassis, but while I had the assembly unscrewed from the aluminium tube that forms the main body, I took it upon myself to change the reflectors too.
Waterproofing is provided by two O-rings in sequence. I performed the operation in a room that was clean enough for eye surgery. It was better than have her try to do the job on a fluffy blanket in her cabin.

Switching
There is a simple switch at the back that has two positions – on and off. There is also a lock to stop it from being switched on inadvertently. Simples.

In The Water
The light emitted was reported to be of a pleasant colour, akin to daylight. Set up as it was with two diffused LEDs and one focused, the missus got the benefit of the wide peripheral beam together with a bright centre spot that enabled her to concentrate on one subject without losing sight of what else was going on around her.
Unaware that I had mixed the reflectors, she commented when she got home that the IST T-100 didn’t penetrate the water any further than her friend’s lamp, which had only one LED. But then it wouldn’t, set up the way it was, would it?
Below are the three beam options available by pick-and-mixing the reflectors.

COMPARABLE LAMPS TO CONSIDER:
Aquasun AQ-370, £139
Scubapro Nova Light 230, £79
UK SL3 eLED, £46

SPECS
PRICE £170
BURNTIME 150min
DEPTH-RATING 100m
BATTERY 6 x AA alkaline
CONTACT www.sea-sea.com