laricil Silly answer above by Flash & 3 friends won]t help. Best use item ID: 1555085 or similar and limit cob temperature after 10mins of use to below 50C temperature for max COB life. Or if prefered use 14v PSU (or car battery) but only with item ID: 1510482 to limit current flow. If you must use a 12vdc supply make sure COB does not go above 50C.

laricil Hi, if you are concered at all about Led life expectancy then, as with ALL Leds you will be better off limiting the current rather than fixing a voltage. The on strip resistances will limit current to a certain extent but unfortunately will produce heat thereby changing strip temperature. Led voltage drop will depend a great deal on local temperature so current control is advisable. See: Item ID: 1377153 or similar wired in between PSU and Led strip with a higher voltage supply so that module can work properly. The higher the ambient temperature the lower the current you should use to get max life from Leds. I haven't tested these yet so I can not supply suggested current for given ranges of ambient temperatures. Like most Bggd products it's a question of "suck-it-and-see" (or wait until someone with experience gives a useful informed review).

laricil Hi Stewart. I think you are assuming same led density per chip-lampbead which is probably NOT the case . The issue is confused by seller quoting Led density per metre rather than Cob density per metre. I would assume various different types of chip so as to cater for those more concerned with heat dissipation (low density 360 perm) @ 12vdc and those who prefer intensity regardless of temperature considerations.(high density 528 per m) @ 24vdc. I would suggest that one 12v COB type contains 120 leds and the other 12v COB type contains 176 leds, which tends to suggest that the 24v Cobs have double Led densities configured in series. "...., the 24v version of led strip will no any voltage drop on full white lights."- demonstrates that sellers English as almost as bad as my Mandarin