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| Author | Birchley divers lamp LED conversion |
royfellows Joined: 13/06/2007 Location: Great Wyrley near Walsall View Profile View Posts View Personal Album View Personal Files View all Photos Send Private Message |
Birchley divers lamp LED conversion
Posted: 01/07/2011 13:45:02 Reply | Quote A customer has brought in a Birchley Products divers lamp for conversion to LED. This was a relatively simple job as I had already used the methodology in a conversion of a Maglite head to a photo lamp. The original power source was a cluster of 10 X 1.2V NiCads giving a working voltage of 12V. After some deliberation I removed these as the voltage was not suitable for what I wanted to fit, being 4 X Cree XM-L at 2,5 amps giving 3200 lumens. The original 12V supply would have had to have been mated to either 3 or 6, I elected to use 6 2500 mAh Li Ion Trusties wired 2 in series X 3 parallel to give 8 volts. The LEDs being connected X2 in series to 2 drivers. The drivers used were the SKU 20330 drivers from dealextreme. As they came the main diodes were 3 amp, NOT 2 amp as incorrectly posted on the DX website. However, as I found it impossible to direct heat sink them in my normal way I uprated these to some real heavy duty 5 amp jobs from Farnell, OK if the form factor isn’t a problem. Quite an overkill but they don’t even seem to get warm now. (click image to open full size image in new window) The key to heat dissipation is the big copper ‘ears’ as can be seen in the picture, inserting this into the aluminium lamp body gives a good thermal contact, just the same way as in the Maglite head conversion I did. The little yellow plug is for recharging using the customers Trigon charger, balance lead to metal of old charging plug. (click image to open full size image in new window) I was disappointed that I could not use 4 of the big reflectors due to lack of space, so used 2 of these plus 2 small ones. These were assembled by the use of epoxy adhesive while standing on a flat surface. Do not fit reflectors to the LEDs separately as you will get separate beams going everywhere. (click image to open full size image in new window) (click image to open full size image in new window) (click image to open full size image in new window) -- ''the stopes soared beyond the range of our caplamps' - David Bick...... How times change IP: 89.240.176.84 Edited: 01/07/2011 13:47:09 by royfellows |
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royfellows Joined: 13/06/2007 Location: Great Wyrley near Walsall View Profile View Posts View Personal Album View Personal Files View all Photos Send Private Message |
Birchley divers lamp LED conversion
Posted: 01/07/2011 14:43:50 Reply | Quote Sorry gang, I should have mentioned the diode is of course a Schottky, I measured the Vf drop at 0.33V. -- ''the stopes soared beyond the range of our caplamps' - David Bick...... How times change IP: 89.240.176.84 |
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