Greenforce Tristar 15 lamp

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Mark Fyvie - 31 Aug 2004 13:25 GMT

Hi all,

I'm thinking about the new Greenforce Tristar 15 lamp head:
http://www.green-force.com/lighthead/Tristar15.php?lang=en

Before anyone jumps to the wrong conclusions - yes I know that the
original Tristar head was not well received. However, this appears to
have five times the original power as the Tristar. Burn time on the
Flex II battery should be 160 minutes, versus 240 minutes for the
HID50 head (15W vs 10W consumption).

I've heard that the output should be slightly better than the HID50,
and that this head is "less fragile" than the HID, and the light is
whiter. But what I really want to know is has anyone actually seen
this in the wild, or even better - dived with one? I'm looking to hear
comments from people with actual experience of this beast...

Thanks in advance,
Mark

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David Walker - 31 Aug 2004 14:07 GMT

> I've heard that the output should be slightly better than the HID50,
> and that this head is "less fragile" than the HID, and the light is
> whiter. But what I really want to know is has anyone actually seen
> this in the wild, or even better - dived with one? I'm looking to hear
> comments from people with actual experience of this beast...

I've never tried the Greenforce LED stuff, but having been a long-time
sceptic about how well LEDs would work underwater I have been
semi-converted. I got a 10 LED torch from Maplin for ?20, does 90 hours on
3x C cells, down to 30m (apparently). Very basic, but tried it for the
first time last weekend and it does seem to work surprisingly well. For
peering into holes it seemed just as good as the HID torch my buddy had, but
haven't done anything deep and dark with it yet so not sure how it would
perform over a greater distance - certainly seems promising though, so
certainly there is the potential for hte technology to work - whether or not
the Greenforce is good I coulnd't say.

David

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TonyH - 31 Aug 2004 18:07 GMT

The big problem with any multi-bulb set-up, irrelevant of the technology, is
that its nearly impossible to properly focus the light into a narrow
penetrating beam.

Not only does this limit the use to reasonably clear water but also means
that it no use as a an underwater signalling device (similar to drawing a
letter 'O' on a postage stamp with a 25mm (1") brush).

> > I've heard that the output should be slightly better than the HID50,
> > and that this head is "less fragile" than the HID, and the light is
[quoted text clipped - 14 lines]
>
> David

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