LED filament bulbs: shapes, bases and dimming

Shapes in the range

Most groups hold several powers, glass finishes and base options. Read the group below, then the model tables further down for the figures.

Where the factory gives them, efficiency runs from 50 lm/W to 110 lm/W and power factor is listed as >0.8 or >0.85. Case quantity is listed as 50 pcs or 100 pcs, and a few models add a 600 pcs carton. Diameter and overall length are printed where the factory gives them. For how the shape codes read against the string-light bulbs, see the bulb shapes guide.

Dimming and the tested dimmer

Most models are listed as dimmable and a few as non-dimmable, so read the Dimmable row on the model you want. Each model's table names the dimmer the factory tested against; on most models it is the Lutron Diva Electronic DVELV-300P and DVCL-153P (factory statement, 2015–2020). Treat that as the bench the factory used, not as a promise for your circuit. Dimming behaviour changes with the load on the channel, the minimum load of the dimmer and the number of bulbs on it, so run your own dimmer at your own load on the sample before you order. The dimmable filament bulbs guide sets out what to test and what to write into your specification.

Indicative prices

Indicative from US$0.7 per piece for a C35 dimmable candle bulb, from US$0.5 for a 4 W G45 and from US$0.2 for a G40 PET replacement bulb (ex-works, before freight and tax, on the factory's Sep 2026 list price plus 20 %; the exact price is confirmed on your quotation).

Shape, power, glass finish, base and quantity all move the figure; every other shape is quoted per configuration.

Documents for this family

The factory states a UL file for its LED filament bulbs; ask for the current listing card for the exact model you order, because a file covers the models named on it and nothing else. CE and RoHS markings on these bulbs are declared by the factory itself; the declaration of conformity and the test reports are requested and will be published here when received. Until then, ask for them with your quotation and treat the marks as the factory's statement. The CE and energy labels guide explains what the EU and the UK ask of a lighting product, and documents and certification sets out what is held and what is asked for, family by family.

Models

Each entry below prints the site reference (Ref. ILT-BLB-nnn) and the factory code where the factory prints one; quote that code in full when you enquire. Every figure is as the factory lists it, on 2015–2020 data, so ask for the current model on your enquiry and confirm the figures and the availability of your shape on your quotation.

Ordering this family

Start with a sample. Send the shape, the base, the power, the glass finish, the dimming requirement and your destination voltage, and the desk returns a quotation naming the exact factory code and configuration; a sample follows, then a proforma invoice, production, inspection with a third-party inspector welcome, and shipment. Payment terms, the currency and the beneficiary account are issued once, on the proforma invoice, and are never changed by email; if an account changes, call the desk on a number you already hold before you pay.

Packing is printed per model: the case quantity row gives the pack count and a few models add a carton count. Private label and retail packaging to specification are factory-stated on the string lights; name the branding you need on your enquiry and what applies to a bulb order is confirmed on your quotation. OEM and private label sets out the options and samples and ordering runs through every step.

Questions buyers ask

Reviewed September 2026.

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