dean
Member
Anyone tried these type of lights ?
What would I need to buy to be able to use them
Could they be dimmed ?
Regards
Dean
I bought some 12V DC (transformed from 240V AC) 3W G4 COB LEDs as a possible replacement for the 20W halogen light sources in our compound microscopes.I have no idea, but COB LED is getting more common as said also in AC 220 spots
Hi all, I bought some 12V DC (transformed from 240V AC) 3W G4 COB LEDs as a possible replacement for the 20W halogen light sources in our compound microscopes.
I needed a physically small lamp that was dimmable (it had to be a G4 fitting, and there is very little clearance for fitting the bulb). They dimmed without changing colour (halogen lamps become a lower colour temperature as they dim), and they looked really bright as a point light source, but they weren't quite bright enough to replace a 20W halogen G4 lamp.
cheers Darrel
Seller says that they can't be dimmed
But video clearly shows they can
I may try some just for the fun
I use metal racking that has all metal shelves so just stick them to underside and job should be a good one
Any suggestions for cheap but not explosive power supply
Regards
Dean
First i would ask the seller a confirmation they are dimmable via PWM.. My educated guess is "Yes".. But i'm not 100% sure.. If yes, i also would not go to deep into technical stuff etc. and give it a try with something simple as this..
http://www.banggood.com/PWM-DC-Moto...ch-Module-6V12V24V28V-3A-1203B-p-1043383.html
Yes they do work as a dimmer/controler they are actualy the only way for SMD led dimming without issues. For examplle the known TC420, 5 channel programmable LED controler. Actualy is a programmable 5 channel PWM device you can not only control SMD leds with it it also could control motors and fans running on DC voltage..So this is not going to work as a dimmer ?
Regards
Dean
Yes they do work as a dimmer/controler they are actualy the only way for SMD led dimming without issues. For examplle the known TC420, 5 channel programmable LED controler. Actualy is a programmable 5 channel PWM device you can not only control SMD leds with it it also could control motors and fans running on DC voltage..
https://en.wikipedia.org/wiki/Pulse-width_modulation
In the link it says PWM Motor Controler, in an other link it could be called PWM LED controler.. But it doesn't make a differnce PWM is PWM, if it is for LED or Motor doesn't make a difference. It probably is put that way for the buyers convinience to give it the name they are looking for.. But it also confuses, they still both do the same thing.
But at first glance i wasn't 100% sure if it would dim COB leds, because i do not know how they pull current.. But since it's running simply and direct from 12 volt car battery my best guess was it should work.