Up to two hours
~4W @ 600 Lumen
25€ with charger
Create a magnetic 4 watt high power LED head lamp for applications like
longboards out of an old hard disk drive for less than 25 $. The case of the HDD can be recycled to a nice room light.
Skating at night can be really dangerous. Other road users won’t see you and you can’t see the road you are riding on. That’s why I invented the Beamboarder. It’s a mobile head light that allows you to ride for up to two hours in absolute darkness with a sight of several meters. The LED and the rechargeable battery can easily be attached to your board on any ferromagnetic material. The Cree LED is a high power light source out of an array of several LEDs with the highest standard of light efficiency you can find actual on the market. Only minimum changes on the longboard truck have to be done. The construction of the lamp is possible with a small amount of money and equipment. Even it’s easy, there are several risks for you and other road users you have to keep in mind. The following instruction shall guide you through the experience I made and how you can build your own Beamboarder by yourself. Keep in mind that this product is still in early prototype status.
Upcycle the case:
At first you will need an old 3.5” hard disc drive (HDD) with as many gigabytes as you can find. Old HDDs with high capacity for their time will have huge magnets from my experience. These HDDs often have multiple discs. Open the case with a Torx 8 screwdriver. Under the large sticker on the cover you will find additional screws that you have to remove. After opening the coverage you see two thick iron plates at the end of the read head. These two plates hold your magnets. In most cases you can remove the first magnet-plate with a lever. The force between the two magnets can be quite strong. For the second magnet-plate you have to remove the read head with a screwdriver. Sometimes this plate is also fixed by some screws on the other side of the HDD. The Beamboarder is based on these two plates. Handle them with caution. When they snap together uncontrolled your finger or the magnets can get damaged. The LED must fit on the iron plate without overlapping. Look at the LED datasheet for the dimensions. A large plate will decrease the temperature of your LED what causes a higher efficiency and longer lifetime. With a small plate the LED is getting to hot and the lifetime will decrease. If you cannot touch the metal anymore do not use it in this way. Try to find HDDs with large plates and stronger magnets.