30% Off coupon code at nitelights.com.au (I Don't have an expiry date for it but it was working as of 0750 this morning)
I Have used many different brands of mountain bike lights over the years (Gloworm, Lupine, Trail LED, Magicshine to name a few), from top of the line big $ set ups to cheap ebay clones and without a doubt NiteLights provide the best bang for your buck lights available.
Materials, build and performance are all top quality, comparable to lights costing hundreds of dollars more. Not only do they sell excellent value lights but their customer service is awesome; they are very reasonable and will go out of their way to help you. If you have issues, problems or concerns email them and chances are they will come of with a solution that makes you happy.
If you want to have a look at what they have to offer before you purchase you can generally find their tents at most of the bigger mountain bike events around including the SCOTT and MONT 24hr races. If you do happen to get to one of their tents during an event you will quickly notice the steady stream of riders walking in and buying new lights before the start of the event - a pretty encouring sign.
Both the Shotfire and Shadowfire are excellent lights - I'm currently using the shotfire mounted on the bars and a shadowfire on my lid. If your looking for a stand alone light you can't go past the shadowfire (mounted to your helmet) but I would recommend both/either. Be mindful that these are intended to be used as mountain bike lights, if using them as commuter lights be careful where they are pointing otherwise you may have to deal with some cranky car drivers.
The only thing I could fault is that somethimes email replies can be a bit slow, although this seems to be a problem when using the website feedback/enquiry as opposed to manually sending an email.
Shipping time is always good/as stated and I have never waited longer than 4 days to receive my orders.
Best bang for your buck?