Involvement:Expert (understands the inner workings) - Ownership:1 week to 1 month
I used them to replace 20W MR16 halogen lamps and they works just fine, with good color temperature and luminosity.
The temperature of the lamps remains in the safe area, at least with the fixtures I mounted them in.
Absorbed power is about 4W, as advertised.
While testing I discovered they can be dimmed: read more in "Other Thoughts".
Nothing is known about the reliability of the product: only time will say ...
I tested the devices I received and here are the results:
between 8.5V and 14V constant luminosity and nearly constant power (4.0-4.3W at 9V, 3.8-4.0W at 13V), so the lamps are slightly more efficient at higher voltages.
between 5.5V and 8.2V the luminosity changes with voltage (less than 0.1W at 5.5V, 4.5W or more at 8.2V): at 8.2V luminosity is slightly higher than at higher voltages.
between 8.2V and 8.5V and between 5.0 and 5.5V the lamps became instable with sudden variation of luminosity, or flicker: I think one should avoid to use them at this voltages.
Under 5.0V the lamps are off.
I'm going to buy more of them, to better test the variable luminosity range between 5.5V and 8.2V I need to build a self-made power supply
Note:Stock and Availability shown on this site is for your reference only. While
we strive to provide the most accurate and timely stock and availability information,
availability information may become out of date and may change between the time
you added an item to cart and the time your order is received.
Quantities on clearance items are limited. Prices are current at time of posting. DX Reserves the right to change prices at any time without notice.