With Philips MR16 Halogen light bulbs, the energy advantage collection has some products that have an aluminum reflector. Thus the "ALU" designation.
Why do some of them have that designation in the ordering code? This reflector pushes all the heat generated by the bulb out the front of the bulb. With ones that don't have the reflector, heat will come through the back as well as the front of the bulb.
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