|The ECD400 Bike Light||To to the HahnTronix Bike Lights Web Page|
This page was last updated on: 10/27/10.
The ECD400 is based on one of my earliest LED bike light designs. Below are images of what the current version looks like.
The ECD400 is based on a couple of Seoul Semiconductor Corporation P4 LEDs.
These produce about 450 lumens with the custom driver I use in them.
I derate the light because it's optics are at best 90% efficient.
Still for a small, lightweight package, it produces a lot of light.
The ECD400 produces nearly 400 lumens of light. This is comparable to what a 20 watt MR11 halogen bulb will produce when driven at it's normal operating voltage. It will run off any battery capable of delivering 9 to 25 volts at about 1 amp. It can even be driven off a small 9V smoke alarm battery for 10 minutes on high or longer on one of the dimmer levels. This gives you the option of carrying an emergency battery small enough to stuff in your seat tool bag.
The standard model of the light comes with the light head, a mounting bracket, a 4 ft extension cord,
and a battery pack designed for use with 8 AA batteries (batteries not included).
I don't typically stock AA batteries and chargers,
as you can typically buy them for less than I can if you find them on sale at a department or camera store.
I especially like some of the new low self discharge NiMh batteries.
You can charge these and forget them.
They will still hold about 80% of their charge a year later.
Sanyo Eneloop batteries are rated as the best low self discharge batteries, but are pretty spendy unless you find them on sale. I have had good experiences with GP ReCyko batteries available here. You may need to search the Adorama Camera site to find the batteries, they move the page around sometimes.
I have had nothing but good experiences with this charger from all-battery.com. Unfortunately you'll spend more on shipping than the charger costs.
You should look for a charger that has Delta-V cutoff technology, not a charger that just uses a timer. Timed chargers will greatly reduce the lifetime of your batteries, as they will often overcharge the batteries. Unfortunelately it's sometimes hard to tell if a charger uses Delta-V to decide when to stop charging. Sometimes it's packaging will mention that the charger is "smart", but a lot of battery company marketing departments seem to be putting that term on timed chargers also. Another term to look for is voltage cutoff.
If you already have an AA battery charger and are wondering if it is "smart", you can do a very simple experiment to check. Charge some batteries. Run them in something (a toy or flashlight)for 15 minutes. Charge them again. If the charger takes 8 hours to charge them, then it's a timed charger. If your charger takes half an hour to an hour to charge the cells, it's probably "smart".
I don't recommend the "ultra-fast" chargers that are out there. They claim to charge batteries in less than half an hour. They are using Delta-V technology, but are charging the batteries very hard. This reduces their number of charge cycles form over 500 to maybe a couple of hundred.