Thingiverse
parametric "halogen desk lamp" to LED strips retrofit by curious_pl
by Thingiverse
Last crawled date: 4 years, 2 months ago
parametric (you can choose how many rows and cols of led strip modules you want to use) retrofit module to turn ordinary halogen desk lamp (very popular here) to LED based lamp.
why?
Those lamps usually operate near their thermal limit. Often found in trash with burnt thermal fuse. If you replace the fuse with NC bimetal thermal switch they get new life. I usually used 50C or 70C switch because temps above degrade the transformer housing plastic.
This turns to be insufficient to drive 20W halogen bulb they are fitted with.
If you disassemble such lamps you often find embritteled and yellowed plastic. I use fair amount of ABS glue to glue broken stuff inside and reinforce everything.
Those lamps are cheap and many people own several broken ones.
so here is LED strip retrofit. LED's consume far less power and make whole thing very eternal and operating in sane temperature ranges.
features of the script
1)You can pick any X and Y size of the led strip, number of modules etc.
2)small box to hide rectifier bridge and capacitor
you will need rectifier bridge (5A shottky diodes from broken computer PSU's are excellent) and capacitor - if you want flicker-free lamp.
check total wattage of modules you plan to install (per module - usually it is 0.24W for regular or 0.72W for 5050 ) - try to not exceed 10W if you want long life of the lamp .
example is for 14 cheap modules, 0.24W each , 3.36W total. not stunning bright but good enough for night reading. if using 5050 modules it total will be 10.08W which should be brighter than original lamp.
ah. final note - do not bother with original glue of the LED strips.
Use nail lacqueer , abs glue or even superglue to fix the strips.
I used wood clips and hard sponge against all modules to make them all flat and even .
enjoy
why?
Those lamps usually operate near their thermal limit. Often found in trash with burnt thermal fuse. If you replace the fuse with NC bimetal thermal switch they get new life. I usually used 50C or 70C switch because temps above degrade the transformer housing plastic.
This turns to be insufficient to drive 20W halogen bulb they are fitted with.
If you disassemble such lamps you often find embritteled and yellowed plastic. I use fair amount of ABS glue to glue broken stuff inside and reinforce everything.
Those lamps are cheap and many people own several broken ones.
so here is LED strip retrofit. LED's consume far less power and make whole thing very eternal and operating in sane temperature ranges.
features of the script
1)You can pick any X and Y size of the led strip, number of modules etc.
2)small box to hide rectifier bridge and capacitor
you will need rectifier bridge (5A shottky diodes from broken computer PSU's are excellent) and capacitor - if you want flicker-free lamp.
check total wattage of modules you plan to install (per module - usually it is 0.24W for regular or 0.72W for 5050 ) - try to not exceed 10W if you want long life of the lamp .
example is for 14 cheap modules, 0.24W each , 3.36W total. not stunning bright but good enough for night reading. if using 5050 modules it total will be 10.08W which should be brighter than original lamp.
ah. final note - do not bother with original glue of the LED strips.
Use nail lacqueer , abs glue or even superglue to fix the strips.
I used wood clips and hard sponge against all modules to make them all flat and even .
enjoy