tech tips

 

   
 

Seeing the Light!

Whether you're dodging impatient cars after a hard day at the coalface, spinning the pedals on a mid-winter training ride, or caning your favourite singletrack... nocturnal missions on the treadly without making the ultimate sacrifice are a constant challenge.

With only modest application of brain and wallet though, you can significantly increase your visual presence on the road and reduce your chances of becoming a statistic. NZ law requires you to have a red or yellow rear reflector of at least 35cm2 in area and either yellow reflectors on the front and rear of the pedals (clearly SPD pedals are not standard issue at bureaucracy central) or reflective straps on your lower legs - at any time of the day or night. At night you also need a white or yellow 'steady-Eddie' front light and a steady or flashing red tail light. Both must be visible from at least 100 metres. You can supplement your steady front light with a white or orange flashing number. Slightly draconian to us free spirited velo-warriors but a sensible minimum requirement, although it does over simplify the variables.

Twinkle, twinkle
On the reflector front ... firstly, bigger is not necessarily better. The smaller the pyramid size in the reflector substrate, the better the reflector. So a little reflector with small reflective pyramids can outperform a big sucker with larger pyramids. Secondly, reflectors and reflective clothing (stripes, etc) only bounce light back in the direction of its source. So in urban areas, where vehicles have their lights dipped, reflectors on the bottom half of your body work better than those on the top. And thirdly, movement catches the eye. Your legs move – hence the reflective logos on each calf on the Daddy Long Legs and Jungle Jims.

You'll want a grunty LED flashing tail light. The latest incarnations of these are awesome. In fact, trash your existing light if it's more than a couple of years' old. We're yet to see anything on the road that outdazzles Cateye's offerings. Check out the benchmark LD600 (NZ$49) or the multi-directional LD1000 (NZ$59) at www.cateye.com. A set of penlight batteries last forever (around 30 and 100 hours respectively). Mount the light high on your seat post. Avoid clipping it to your body or backpack – when you bend forward it's nine tenths useless.

New to the reflective market is the Exelite 'safety belt'… a self-illuminating band worn like a beauty contestant's sash across your shoulders, and at a stretch over your backpack too. Powered by four AAA NI/MH rechargeable batteries (smart charger included in the NZ$ ?? price tag), illumination is generated by radio frequency rather than conventional incandescent light. Very sci-fi. The resultant Homer Simpson radioactive green (or alternatively 'boy racer' blue neon) glow is highly visible at night and through pea-soup fog. Unlike standard reflective material, you're visible from all angles. What's more, all this Star Trek wizardry is home grown down at Otago University. Learn more at www.exelite.co.nz

Full moon
Up front, the erstwhile undisputed heavyweight champion of the night riding scene has been the venerable halogen. Alas its glory days appear numbered, with the advent of super bright LEDs and HID (High Intensity Discharge) lights that no longer sport a NASA price tag.

For off-road riding more really is better. HID lights are about four times more efficient than halogens – a 12 watt HID throwing out the equivalent light of a 50 watt halogen. That'll make you feel about as well endowed as Sebastian Loeb's Citroën and will suitably stun errant marsupials in your path. All this machismo comes with a weighty price tag though. Expect to pay NZ$500-600 for a light, charger and 'top shelf' lithium ion battery.

www.mtbr.com/spotlight/lightshootout/ succinctly summarises the options from the major brands. A mate of Ernie's recently pointed him to an outfit selling a motorcycle version for US$210 plus freight and tax. Quite a bargain – the compromise is the excessive cabling, ie. added weight and bulk. Check out... www.batteryspace.com

The latest LED technology is very impressive and gets better by the moment. They are compact, produce a lot of very white light, and run on the smell of an oily rag. The brightest models throw out roughly the equivalent amount of light to a 12 watt HID… and will run almost all night at lower outputs. As you'd expect with cutting edge technology, prepare to mortgage your bike to get the good stuff – about the same as a top quality HID (NZ$500-600). Cateeye.com and Nightlightning.co.nz have 'double meat and bacon' models that are worth a gander. However most manufacturers are touting new models to be released over the next year.

If all these acronyms are too intimidating for your wallet, then you should be able to source a 20 watt halogen and Ni-MH battery for NZ$200-400. Alternatively, build your own. You can bolt together a basic system with standard auto-electrical parts and lead acid battery for around a hundred bucks. www.jeremyb.net/projects.html has step-by-step instructions or ask around at your local club.

Power to the people
Choose either a nickel metal hydride (Ni-MH) or lithium ion (Li-Ion) battery to fuel your headlight. Ni-MH batteries are used in most new lighting systems. They're lighter and boast longer burn times than 'legacy' Ni-Cad batteries. State-of-art Li-Ion batteries (like those used in laptops) weigh a third less than Ni-MH, but cost twice as much and are a tad more temperamental. The old workhorse lead acid 'gel cells' are very cheap but are about twice the weight of a Ni-MH equivalent. Whatever power source you choose, it's important to follow the prescribed charging regime to avoid shagging your expensive battery. Modern batteries no longer need to be fully discharged (this was only the case for the old Ni-Cads), and in the case of lead acid batteries it's important not to run them completely flat.

… like a dog's bollocks
Back on the tarmac, headlight choice is about being seen rather than seeing. A 5-10 watt halogen with a separate rechargeable Ni-Cad or Ni-MH battery is ample, and reasonably priced at around NZ$100-200. You get a couple of hours burn time and loads of presence amongst the traffic. But when the battery runs out of puff the light fades fast and without warning. You need a back up - a small LED is the go. There's any number to choose from but once again Cateye has a snappy solution with the ultra-compact HL-EL400 (NZ$59). Three AAA batteries provide 80 hours of glow (160 hours in flash mode). It is extraordinarily bright, especially front on, but is still dwarfed by the halogen. The two lights in tandem are cheap insurance to ensure you don't end up decorating some car's front bumper.

Right height
For travelling in traffic, mount your lights on the handlebars so they're at the height motorists expect to see them. With helmet mounted jobs you may be mistaken for a coal miner rather than a cyclist travelling at speed. And while it's tempting to shine them directly into cars so the driver knows you're there, with a high output light you risk the blindingly obvious consequences.

Off-road, helmet mounted lights let you shine them in the direction you're looking, rather than where the bike is pointing. Great for twisty single track. However they produce less shadowing than the handle bar versions so it can be more difficult to spot terrain changes and obstacles. If you're limited to a single light then go for the helmet mount. A combination of both is a fabulous money-no-object solution.

May the force be with you.