IES parameter is different from Lumen.It includes more data for LED light,include:Light Distribution,Light Intensity,Beam angle,UGR,etc.These are very useful for lighting project designers.
And We already know:for good quality LED Lights, the Lumen reduction is very small after working for years.
So,a question come:After the LED lights working for a long time, will these IES parameters change?
- Beam Angle
- X、Y Value
Because the Diodes packaging material may change some physical properties during the long time working(heat),as well as the lense and reflector material.
To study this,we(FCS) prepared 3 pcs of LED Downlight,build below test model:
1.Use Gonio photometer and Integrating Sphere to test these lights,get the original data:IES Data and Spectrum Data.
2.Let these lights working under a high temp (65~70℃) for 1 week.
3.Retest these lights to get data.
Now the test finished, we can see:
There is no obvious change on these data!
The data include: Power, Power factor, UGR, Beam Angle,Lumen Efficiency,Ra,X&Y Valume,etc.
See below Summary for Beam Angle:
See below Summary for X&Y Value:
See below summary for other data:
1.We used very good quality components and procedure to assemble these lights samples.
2.High Temperature testing is very helpful for us to get some reference data, but it's not 100% same as long time testing.
3.Duiring our testing,we used reflector, but not lense.These 2 items may offer different physical properties
We provide below professional service to LED Lighting importers, buyers, traders, project owners:
1.LED Lighting Sample testing
2.Chinese lighting supplier's Evaluation/Audit
3.Inspect LED Lighting during production, and before shipment.