Published:
17 March 2015
Category:
Q&A
Neil asks this question, which concerns whether using acrylic for the hub of a conventional style light shade is safe. It has been answered by the Lighting Industry Association (LIA), formerly the LIF (Theme – Lighting):
This Q & A is one of thousands posted in our Technical Expertise area, and answered on a daily basis by our Voltimum Experts.
Question: I would like to know whether it would be OK to use a plastic - such as acrylic - for the hub of a normal(ish) light shade?
The light shade in no way impedes free release of air for natural cooling.
The shade will be rated at 28W. In my understanding, as long as the material is 30mm+ from the heat source, it should be OK. But am I right?
When I say normal(ish), the hub is approximately 100mm wide, 3mm thick and has a 28mm hole to fit over a standard UK light fitting.
Also, if the hub is indeed OK, are there any requisite markings that need to be put on to it for safety, besides the 28W marking?
Answer: Acrylic will deform under high temperatures, just put a piece in the oven to see that.
Without knowing exactly the design of the shade, it is impossible to comment with confidence.
My recommendation would be to consult BS/EN 60598 and satisfy yourself that the test conditions can be met. A 28W halogen generates a lot of heat and I would be concerned about acrylic over that lamp, but a CFL lamp or suitably shaped LED light source with a heat sink well away from the plastic might be acceptable.
I'm afraid the answer is you'll have to test it. The LIA Laboratory can carry out the necessary tests for you.
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