Wall Sconce CRI: Will a Cheap LED Make Terracotta Brown?

We publish no CRI and no R9 for any of our wall sconces, and this one arrives with two empty G9 sockets, so the colour your terracotta room ends up wearing belongs to a bulb we never sold you. Printing a number we had not measured would be worse than the blank.

The harder truth is that the figure you are hunting would not have settled it anyway. A CRI score averages eight muted test swatches, and strong red is not one of them. Below: why the number is missing from the bulb box too, the 2005 measurement proving two lamps can share a CRI of 80 and disagree about red, and the one figure worth demanding.

Why is there no CRI on the wall sconce listing for my terracotta room?

Because the light in that room will not come out of anything we sold you. The sockets are two G9 with bulbs not included and 5W LED each recommended, so color rendering here is a bulb decision, not a fixture decision. The same table gives molded resin with a ribbed fluted texture, 6.5 in (16.5 cm) tall, 5.5 in (14 cm) wide, 3.1 in (8 cm) off the wall, light thrown up and down through an open top and bottom, AC 90-260V, coverage of 5 to 10 square meters (55 to 110 sq ft). No lumen figure, no Kelvin figure, no CRI, no R9 — none of those were measured by us.

The fitting still shapes what your cushions see. Being an up-and-down sconce, much of its output hits the paint first and reaches the sofa second, carrying back whatever the wall gives it. On rust or burnt orange that bounce is warm before the bulb's spectrum is counted.

The ceiling spotlight is rated CRI 98.

Why isn't CRI printed on the bulb box in the shop either?

Because in the United States it is not permitted to be there. The Lighting Facts panel is defined by 16 CFR 305.23(b)(3), and its list is closed: brightness in lumens, yearly energy cost, life in years, “Light Appearance” in degrees Kelvin, wattage, the ENERGY STAR logo, design voltage if other than 120 volts, and a mercury statement where needed. Paragraph (b)(3)(ix) shuts the door: “No marks or information other than that specified in this part shall appear on the Lighting Facts label.” Colour rendering is absent, so it may not be added.

Cross the Atlantic and the rule inverts. Commission Regulation (EU) 2019/2020, Annex II point 3(b)(1)(i), requires “the colour rendering index, rounded to the nearest integer” on the packaging of a bulb sold on its own, and Table 4 of the same annex has applied a floor of CRI 80 or better since 1 September 2021. A shopper in Dublin reads it off the sleeve; a shopper in Denver is barred from doing the same.

Read the last row twice: neither market obliges anyone to print R9, the score that decides whether rust stays rust.

Would a CRI 90 bulb have kept my rust cushions rust?

Not on its own, and a published measurement shows why. Yoshi Ohno at NIST modelled two three-chip white LEDs at 3300 K with the same general CRI, in Optical Engineering in 2005. Both scored Ra 80, yet one rendered strong red at R9 of -90, which Ohno describes as “appearing brown”, while the other reached R9 89. Across the four saturated samples they scored 27 and 88. One headline number, two different rooms.

The reason is arithmetic. Ra is the mean of the first eight test colours, described in that paper as “medium-saturated”; strong red is R9, and Ohno states plainly that “R9 is not included in the calculation of Ra”. A spectrum with a hole where deep red belongs still averages well over eight pastels. His summary: “Lack of the red component shrinks the reproducible color gamut and makes the illuminated scene look dull.” Rust and terracotta live in the region being shrunk, the same trouble behind a rust brown disc that reads orange to one person and red to another.

Two further things stop CRI being a yardstick. The Department of Energy's fact sheet on LED colour characteristics warns that “two light sources with the same CCT and CRI may not render colors the same way”, and its footnote adds that “it is not appropriate to compare the CRI values for sources of very different CCTs.” A CRI 90 bulb at 2700 K and a CRI 90 bulb at 5000 K were not marked against the same paper — below 5000 K the reference is a black body, above it a daylight model. Ohno adds that the colour space inside the formula exaggerates R9 “by factor of 2 or more”, so an R9 of 5 is barely present.

What R9 figure should I insist on before I pay?

Fifty. Two American programmes put a number on red rendering, and they are nowhere near each other. ENERGY STAR Lamps V2.1, section 9.7, requires a solid-state lamp to have “a color rendering index (Ra) ≥ 80” and “an R9 > 0” — a floor pitched at merely above nothing, which given the exaggeration Ohno describes is barely a floor. California's Title 24 Joint Appendix 8 is the serious one. The California Lighting Technology Center's 2019 code summary records the JA8 requirement as 90 or greater for Ra and 50 or greater for R9, for lamp types the state does not otherwise regulate.

That carve-out matters for a G9 fitting. Title 20's Appliance Efficiency Regulations define a state-regulated LED lamp as one carrying an E12, E17, E26 or GU-24 base, held to Ra 82 with R1 to R8 at 72 or better. G9 is not on that list, which reads as putting it in the other bucket, where JA8 asks for Ra 90 and R9 50. That is my reading of two documents rather than a ruling, but it is the line I would hold a bulb to.

Neither line promises anything about your cushions; they are just the two places somebody already made a maker measure R9.

From the shop

Fluted Resin Hallway Sconce, Up Down Wall Light in 4 Colors, Two G9 Bulbs

Houseland lists two G9 sockets, bulbs not included, 5W LED each recommended, so the colour rendering is yours to choose. Molded resin, 6.5 in (16.5 cm) tall, hardwired on AC 90-260V, throwing light up and down; the Orange shade is a terracotta.

View the fluted up-down sconce — 4 colours & current price

How do I find the R9 for a G9 bulb before I buy it?

Read the lamp, then the spec sheet, then ask a human.

1. Turn the bulb over and hunt for “JA8-2019” or “JA8-2019-E”. The California Lighting Technology Center says compliant lamps must carry that mark on the light source itself, and it brings the Ra 90 and R9 50 line with it.
2. Shopping in the EU or Northern Ireland? Read the sleeve. CRI is a required line there. It will not hand you R9, but it saves the hunt for Ra.
3. Open the maker's own spec sheet, the PDF behind a downloads tab, not the marketplace bullet points. R9 is either printed next to Ra or it was never measured.
4. Ask the seller in writing for R9, or the TM-30 pair Rf and Rg. A maker who tested has them to hand, and silence is itself an answer.
5. Read an ENERGY STAR logo as a guarantee of R9 above zero and nothing past it.

If all five come back empty, you are not buying a known quantity.

How should I test a bulb against my own rust and terracotta?

Put the candidate bulb in the fitting that will hold it, on the wall it will sit on, after dark. A bulb judged in a table lamp in a lit room tells you nothing about a sconce that throws half its output at the paint before any of it reaches the sofa.

1. One source only: switch off the ceiling fitting and every lamp. CIE S 017:2020 defines chromatic adaptation as the “visual process whereby approximate compensation is made for changes in the colours of stimuli”, so with two spectra burning your eye splits the difference and buries the fault.
2. Judge the object, not your memory of it. Hold the rust cushion or the terracotta pot against the wall. Deeply saturated red collapses first.
3. Wait two or three minutes. Adaptation is quick but not instant, and a snap verdict drifts.
4. Carry the same object to a north-facing window at midday. That reference is free.
5. Photograph both with white balance locked — a camera does not adapt as your eye does, which is half the story behind why a piece arrives looking different from its photograph.

One thing not to do: reach for a warmer bulb because the room feels dim. Steve Fotios's 2017 review in LEUKOS graded nine credible studies of the old Kruithof rule — five reject it, one partly supports it, three are unclear. What survives is that colour temperature has “a negligible effect on ratings of brightness and pleasantness”, while illuminance under roughly 300 lux reads as unpleasant and 500 lux is enough. Dimness is a lumens problem; brown cushions are not.

What I'd do

Buy the fitting for what it is, and buy the colour separately. Houseland publishes no CRI, no Kelvin and no lumen figure here; the spec table stops at the hardware, molded resin 6.5 in (16.5 cm) tall, 3.1 in (8 cm) from the wall, hardwired, two G9 sockets and no bulbs in the box. Your rust and terracotta get decided in the bulb aisle.

So: a G9 stamped JA8-2019 if you can find one, an R9 of 50 or better from the maker's sheet if you cannot, and one bulb rather than a pack. Test it in the fitting, on the wall, everything else dark, against the cushion you are worried about. If red comes back at the window and dies under the sconce, no dimmer or shade recovers it. Change the bulb.

The wiring is the other half. Hardwiring makes installation electrical work, not decorating: in England and Wales it falls under Part P of the Building Regulations, and in the United States under the NEC as your jurisdiction has adopted it, with local permits on top. Where your market's rules call for a qualified electrician, use one. Our walkthrough on hardwiring a wall sconce in a kids room runs the sequence; the note on whether resin sconces survive a busy hallway covers the body. The rest of the range sits in the wall lamps collection, and whichever one you pick, the number that decides your cushions is printed on a bulb, not on us.